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ALL HAP MEDIUM flashcards
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Card 1
Which of the following is a primary function of the endocrine system, distinguishing it from the nervous system?
A. Metabolism and tissue maturation. The endocrine system is known for its widespread, longer-lasting regulatory actions, which include processes like metabolism and tissue maturation, unlike the rapid, targeted signals of the nervous system.
Card 2
The neuroendocrine system is responsible for controlling a variety of functions. Which of the following is NOT listed as a control function of the neuroendocrine system?
D. Direct transmission of signals between internal organs. While the neuroendocrine system ensures communication for homeostasis, the direct transmission of signals between internal organs is primarily a function of the nervous system alone, not a listed control function of the neuroendocrine system.
Card 3
Hormones are classified into different types based on their chemical structure and how they interact with target cells. Which hormone class typically interacts with receptors on the cell surface because they cannot enter the cells?
C. Proteins and polypeptides. Proteins and polypeptides are large molecules that cannot easily pass through the cell membrane, so they bind to specific receptors located on the surface of target cells to exert their effects.
Card 4
A patient is experiencing symptoms of increased cell sensitivity to a particular hormone. This phenomenon, where the number of receptors on target cells increases, is known as:
A. Up-regulation. Up-regulation refers to an increase in the number of receptors on target cells, which enhances the cell's sensitivity to a specific hormone.
Card 5
Which of the following factors directly influences the physiological effect of a hormone?
C. Both its plasma concentration and the number of active receptors. The physiological effect of a hormone is directly related to both its concentration in the plasma and the quantity of active receptors present on target cells.
Card 6
The hypothalamus plays a crucial role in maintaining homeostasis. Which of the following is a function primarily controlled by the hypothalamus?
B. Control of appetite, sexual behaviour, and emotional responses. The hypothalamus is critical for homeostasis and controls daily physiological cycles, appetite, sexual behaviour, emotional responses, and body temperature.
Card 7
Which hormone, secreted by the posterior lobe of the pituitary gland, is primarily responsible for regulating water conservation?
A. ADH (vasopressin). Antidiuretic hormone (ADH), also known as vasopressin, is secreted by the posterior pituitary and plays a key role in regulating water balance by promoting water reabsorption in the kidneys.
Card 8
A child is diagnosed with a condition characterized by excessive growth hormone (GH) production during childhood, leading to abnormally tall stature. This disorder is called:
B. Gigantism. Gigantism is a pituitary disorder resulting from excess growth hormone (GH) secretion during childhood, before the growth plates have fused, leading to overall increased body size.
Card 9
The thyroid gland produces hormones that are essential for various metabolic processes. Which of the following is a primary function of T3 and T4 hormones?
D. Raising metabolic rate and increasing protein synthesis. Thyroid hormones (T3 and T4) are crucial for regulating metabolic rate, increasing protein synthesis, mitochondrial number, glucose uptake, glycolysis, gluconeogenesis, and lipid mobilization.
Card 10
Which of the following endocrine glands is primarily responsible for regulating calcium levels by increasing bone resorption and calcium absorption?
C. Parathyroid glands. The parathyroid glands secrete parathyroid hormone (PTH), which is the main regulator of calcium levels in the blood, primarily by increasing bone resorption and calcium absorption.
Card 11
The adrenal glands secrete several hormones vital for stress response and metabolism. Which of the following are the main hormones secreted by the adrenal glands?
A. Steroids, adrenaline, and noradrenaline. The adrenal glands produce steroids (like cortisol), adrenaline (epinephrine), and noradrenaline (norepinephrine), which are crucial for stress response, metabolism regulation, blood pressure, and electrolyte balance.
Card 12
Melatonin, a hormone that regulates circadian rhythms, is secreted by which endocrine gland?
B. Pineal gland. The pineal gland is responsible for secreting melatonin, a hormone that plays a key role in regulating the body's circadian rhythms and reproductive hormones.
Card 13
Insulin and glucagon are hormones produced by the pancreas. What is their primary role?
D. Regulating plasma glucose levels. Insulin and glucagon work antagonistically to regulate blood glucose levels, with insulin promoting glucose uptake and storage, and glucagon increasing glucose release from storage.
Card 14
Corticotrophin-releasing hormone (CRH) is secreted by which gland?
A. Hypothalamus. The hypothalamus secretes several releasing and inhibiting hormones, including Corticotrophin-releasing hormone (CRH), which regulates the pituitary gland.
Card 15
Which of the following pituitary disorders is characterized by excess growth hormone (GH) in adulthood?
A. Acromegaly. Acromegaly is a condition caused by excessive growth hormone (GH) secretion that occurs after the growth plates have fused in adulthood, leading to enlargement of hands, feet, and facial features.
Card 16
What is the primary function of Human Growth Hormone (GH)?
C. Stimulates amino acid uptake, protein synthesis, and long bone growth. GH acts as a potent anabolic agent, promoting muscle hypertrophy, sparing plasma glucose, and stimulating the liver and tissues to release insulin-like growth factors (IGFs).
Card 17
Hypothyroidism is a disorder of the thyroid gland. Which of the following symptoms is typically associated with hypothyroidism?
A. Decreased metabolism, weight gain, and decreased heart rate. Hypothyroidism results from low T3 and T4 levels, leading to a decreased metabolic rate, weight gain, reduced heart rate, blood pressure, and muscle tone.
Card 18
Which hormone is responsible for promoting anabolic processes, skeletal muscle growth, and reproductive function?
B. Androgens (e.g., testosterone). Androgens, such as testosterone produced by the testes, are responsible for promoting anabolic processes, skeletal muscle growth, and various reproductive functions.
Card 19
The neuroendocrine system ensures communication between body parts and organs. Which system allows for rapid transmission of communication within this system?
A. Nervous system. The nervous system is characterized by its ability to allow rapid transmission of communication, in contrast to the endocrine system's slower, widespread, and longer-lasting effects.
Card 20
Down-regulation of receptors is a mechanism that reduces cell sensitivity to a hormone. A common example of this in a disease context is:
D. Insulin resistance. Insulin resistance is an example of down-regulation, where target cells decrease the number of insulin receptors, leading to reduced sensitivity to insulin and impaired glucose uptake.
Card 21
Which of the following is NOT a factor determining the concentration of hormones in plasma?
D. The size of the endocrine gland. While the size of the gland can influence hormone production capacity, the immediate plasma concentration is directly dependent on the rate of secretion, metabolism/excretion, quantity of transport proteins, and changes in plasma volume.
Card 22
The thymus gland plays a role in the immune system. What is its primary function?
C. Makes white blood cells. The thymus gland is responsible for the maturation of T-lymphocytes (a type of white blood cell), which are crucial for protecting the body against infections.
Card 23
Which of the following hormones is secreted by the anterior lobe of the pituitary gland?
B. TSH (Thyroid-Stimulating Hormone). The anterior pituitary secretes several hormones, including TSH, ACTH, FSH, LH, MSH, GH, and Prolactin.
Card 24
Steroid hormones are unique because they can interact with receptors located:
A. Inside the cytoplasm and nucleus of target cells. Steroid hormones are lipids, allowing them to easily pass through the cell membrane and bind to receptors within the cytoplasm or nucleus to directly influence gene expression.
Card 25
A patient presents with high plasma osmolarity due to dehydration. Which hormone's secretion would likely be increased to help regulate water conservation?
B. ADH (vasopressin). High plasma osmolarity, such as from dehydration, stimulates the release of ADH from the posterior pituitary, which then acts on the kidneys to increase water reabsorption and conserve body water.
Card 26
Which of the following hormones is secreted by the posterior lobe of the pituitary gland?
B. ADH. The posterior pituitary gland secretes Antidiuretic Hormone (ADH) and oxytocin, while the anterior lobe secretes seven other hormones.
Card 27
A patient presents with symptoms including decreased metabolism, weight gain, constipation, and drowsiness. Which endocrine disorder is most likely?
A. Hypothyroidism. These symptoms are characteristic of hypothyroidism, which is caused by low levels of T3 and T4 thyroid hormones.
Card 28
Which of the following is a primary function of the parathyroid hormone (PTH)?
C. Increasing calcium release from bones. PTH is crucial for calcium regulation and primarily acts by stimulating osteoclasts to release calcium from bones.
Card 29
What is the main role of the pineal gland in the human body?
B. Regulating circadian rhythms. The pineal gland produces melatonin, which is essential for regulating the body's sleep-wake cycles and other circadian rhythms.
Card 30
Which of the following disorders is characterized by excess growth hormone (GH) secretion in adulthood?
D. Acromegaly. Acromegaly results from an excess of GH in adulthood, leading to abnormal growth of hands, feet, and face, whereas gigantism occurs in childhood.
Card 31
Which gland is responsible for producing lymphocytes for immune defense?
A. Thymus. The thymus gland produces lymphocytes, which are a type of white blood cell crucial for the body's immune defense.
Card 32
Which of the following is a function of insulin produced by the pancreas?
C. Facilitating glucose uptake and promoting glycogenesis. Insulin helps cells absorb glucose from the blood and stimulates the conversion of glucose into glycogen for storage.
Card 33
What is the primary function of testosterone, secreted by the testes?
D. Promoting skeletal muscle growth and anabolic metabolism. Testosterone, an androgen, plays a key role in stimulating muscle hypertrophy and anabolic processes.
Card 34
Which of the following best describes neuroendocrine cells?
A. Hybrid cells that receive nervous signals and respond by secreting hormones. Neuroendocrine cells possess characteristics of both neurons and endocrine cells, allowing them to bridge the nervous and endocrine systems.
Card 35
Which endocrine disorder is associated with low T3 levels, causing decreased metabolism and weight gain?
B. Hypothyroidism. This condition is characterized by an underactive thyroid gland, leading to a reduction in metabolic rate and associated symptoms.
Card 36
What is the primary role of the hypothalamus in maintaining homeostasis?
C. Releasing hormones that regulate pituitary gland function and controlling appetite, sexual behavior, and body temperature. The hypothalamus is a critical control center for many homeostatic functions.
Card 37
A patient is diagnosed with Cushing disease. Which hormone is in excess?
A. ACTH. Cushing disease is caused by an excess secretion of Adrenocorticotropic Hormone (ACTH), typically due to a pituitary tumor.
Card 38
Which of the following is NOT a function of thyroid hormones (T3 and T4)?
D. Decreasing protein synthesis. Thyroid hormones actually increase protein synthesis, along with raising metabolic rate, increasing mitochondrial number, and promoting glucose uptake.
Card 39
What condition results from hyposecretion of thyroid hormones during development, leading to mental retardation and short stature?
B. Cretinism. Cretinism is a severe form of congenital hypothyroidism that impairs physical and mental development if untreated.
Card 40
Which system is primarily responsible for slower, long-term regulation of body functions?
C. Endocrine system. The endocrine system uses hormones to provide long-term regulatory control over various bodily processes, in contrast to the rapid responses of the nervous system.
Card 41
Which of the following is a primary function of the cardiovascular system in homeostasis?
A. Transportation of oxygen, nutrients, hormones, heat, and waste. The cardiovascular system is vital for distributing essential substances and removing waste products throughout the body.
Card 42
What is the main role of the integumentary system in homeostasis?
D. Temperature control and barrier function. The skin, hair, and nails protect the body from external threats and play a crucial role in regulating body temperature.
Card 43
Which of the following is a common physical symptom of endocrine disorders?
B. Muscle weakness. Endocrine disorders can manifest with a variety of symptoms, and muscle weakness is a frequently observed clinical sign.
Card 44
What is the consequence of decompensation in the context of pathology?
A. Failure of physiological adjustments to maintain homeostasis. Decompensation occurs when the body's compensatory mechanisms are overwhelmed, leading to a breakdown of stable internal conditions.
Card 45
Which gland produces hormones that regulate metabolism, growth, mood, and reproduction?
C. Endocrine glands. This is the collective function of various endocrine glands throughout the body, each producing specific hormones for these processes.
Card 46
Which hormone's secretion is increased by high plasma osmolarity (e.g., dehydration) and low plasma volume (e.g., blood loss)?
A. ADH. Antidiuretic Hormone (ADH) helps the body conserve water, and its release is stimulated by conditions indicating a need for increased water retention.
Card 47
What is the primary function of glucagon, produced by the pancreas?
B. Raising plasma glucose levels. Glucagon counteracts insulin by stimulating the liver to release stored glucose, thereby increasing blood sugar levels.
Card 48
Which of the following is a disorder caused by thyroid enlargement due to iodine deficiency?
D. Goitre. Goitre is a non-cancerous enlargement of the thyroid gland, often resulting from insufficient iodine intake.
Card 49
Which of the following is a characteristic of human growth hormone (GH)?
C. Stimulates amino acid uptake and protein synthesis. GH acts as an anabolic agent, promoting the building of tissues and muscle growth.
Card 50
What is the primary homeostatic role of the renal (urinary) system?
B. Regulation of water, salts, pH, and blood pressure. The kidneys are crucial for filtering blood, maintaining fluid and electrolyte balance, and regulating blood pressure.
Card 51
Which of the following is the primary homeostatic function of the renal system?
D. Regulation of water, salts, pH, and blood pressure. The renal system is responsible for filtering waste and fluids, and critically regulates electrolytes, pH, and blood pressure.
Card 52
The integumentary system performs several functions. Which of the following is its primary homeostatic role?
A. Temperature regulation and barrier protection. The integumentary system, comprising skin, hair, and nails, is crucial for controlling body temperature and acting as a protective barrier against the external environment.
Card 53
Which muscle type is characterized by being involuntary, branched, striated, and interconnected by intercalated discs?
B. Cardiac muscle. Cardiac muscle is found exclusively in the heart, exhibits these specific structural features, and is responsible for the rhythmic contractions that pump blood.
Card 54
Which of the following describes the function of arterioles in the cardiovascular system?
C. Vasoconstrict/vasodilate to control blood flow. Arterioles are smaller arteries with smooth muscle that can narrow (vasoconstrict) or widen (vasodilate) to regulate blood delivery to specific tissues.
Card 55
Which component of blood is primarily responsible for the immune/security response?
C. White blood cells. White blood cells (leukocytes) are a crucial part of the immune system, identifying and fighting off pathogens and foreign invaders.
Card 56
What is the main function of capillaries in the cardiovascular system?
B. Exchange site—O2/nutrients out, CO2/waste in. Capillaries have thin, one-cell thick walls and a large surface area, making them ideal for the exchange of gases, nutrients, and waste products between blood and tissues.
Card 57
Which connective tissue sheath surrounds an entire whole muscle?
A. Epimysium. The epimysium is the outermost layer of connective tissue that encloses the entire muscle, providing structural integrity.
Card 58
What occurs at the arteriole end of a capillary bed?
A. Filtration, where high pressure pushes fluid out into tissues. At the arteriole end, higher blood pressure forces fluid, along with oxygen and nutrients, out of the capillaries and into the surrounding tissues.
Card 59
Which of the following vessels carries deoxygenated blood from the right ventricle to the lungs?
B. Pulmonary trunk. The pulmonary trunk originates from the right ventricle and branches into the pulmonary arteries, which transport deoxygenated blood to the lungs for gas exchange.
Card 60
The left coronary artery (LCA) divides into two main branches. Which branch is often referred to as the 'widow-maker' due to its critical supply to the front of the heart and interventricular septum?
A. Left anterior descending (LAD). Blockage of the LAD artery is particularly dangerous because it supplies a large area of the left ventricle and the interventricular septum, leading to severe myocardial infarction.
Card 61
Which of the following systems is responsible for rapid control and immediate adjustments in maintaining homeostasis?
A. Nervous system. The nervous system uses electrical signals for quick communication and response, allowing for immediate adjustments to maintain the body's internal balance.
Card 62
What is the primary role of the Endocrine system in homeostasis?
B. Hormonal regulation over longer periods. The endocrine system produces and secretes hormones that regulate various bodily functions, including metabolism, growth, and mood, over extended durations.
Card 63
Which statement accurately describes the function of veins?
D. Returns blood to heart. Veins are low-pressure vessels that collect deoxygenated blood from venules and transport it back to the heart.
Card 64
What is the primary function of platelets in the blood?
D. Clotting/emergency repair. Platelets are small, irregular-shaped cell fragments essential for hemostasis, forming a plug to stop bleeding at injury sites.
Card 65
Which of the following accurately describes the location of the heart?
C. Mediastinum—central thoracic cavity, behind/left of sternum, between lungs. The heart is situated in the mediastinum, a central compartment of the thoracic cavity, slightly to the left of the sternum and between the two lungs.
Card 66
What is the function of the endocardium layer of the heart wall?
C. Inner lining. The endocardium is the smooth, innermost layer that lines the heart chambers and covers the heart valves, providing a frictionless surface for blood flow.
Card 67
Which of the following is a key feature of smooth muscle?
D. Slow, sustained contractions for moving substances. Smooth muscle is involuntary, non-striated, and found in the walls of hollow organs, where it performs slow, prolonged contractions to move substances like food or blood.
Card 68
When does decompensation occur in the context of pathology?
D. When physiological adjustment mechanisms fail. Decompensation happens when the body's compensatory mechanisms, like increased heart rate or hormone release, are no longer sufficient to counteract stressors, leading to disease.
Card 69
Which system is primarily responsible for nutrient availability?
A. Digestive system. The digestive system breaks down food into absorbable nutrients and ensures their availability to the body, playing a crucial role in energy supply.
Card 70
What is the role of the Aorta in the cardiovascular system?
C. Distributes oxygenated blood from the left ventricle to the body. The aorta is the largest artery in the body, receiving oxygenated blood from the left ventricle and distributing it to systemic circulation.
Card 71
Which of the following accurately describes the function of the right pump of the heart?
A. Receives deoxygenated blood from tissues and sends it to pulmonary circulation (lungs). The right side of the heart collects deoxygenated blood from the body and pumps it to the lungs to be oxygenated.
Card 72
What happens during reabsorption at the venule end of a capillary bed?
B. Lower pressure and osmotic pull from blood proteins cause fluid to move back into the capillaries. As blood pressure drops and osmotic pressure from plasma proteins increases, fluid is drawn back into the capillaries at the venule end.
Card 73
Which system provides structural support, protection, and produces blood cells?
A. Skeletal system. The skeletal system forms the body's framework, protects internal organs, and its bone marrow is responsible for the production of blood cells.
Card 74
How does the cardiovascular system link with the integumentary system?
B. Blood flow regulates temperature and skin health. The cardiovascular system plays a vital role in thermoregulation by adjusting blood flow to the skin, which helps dissipate or conserve heat, and also supplies nutrients for skin health.
Card 75
Which of the following is the 'pacemaker' of the heart, initiating the electrical impulses for contraction?
A. SA node (sinoatrial node). The SA node, located in the right atrium, generates electrical impulses at a regular rate, setting the rhythm for the heart's contractions.
Card 76
Which of the following describes the primary function of the Left Anterior Descending (LAD) artery? A. Supplies the right atrium and right ventricle. B. Supplies the left atrium and lateral wall of the left ventricle. C. Supplies the front of the heart and interventricular septum. D. Contributes to the posterior descending artery.
C. The Left Anterior Descending (LAD) artery, often called the 'widow-maker,' specifically supplies the front of the heart and the interventricular septum. Blockage here can lead to severe myocardial infarction.
Card 77
What is the main consequence of atherosclerosis in arterial walls? A. Increased blood flow and nutrient delivery. B. Narrowed lumen, reduced blood flow, and increased blood pressure. C. Enhanced tissue perfusion and oxygenation. D. Decreased risk of clot formation.
B. Atherosclerosis is characterized by the build-up of fatty plaques in arterial walls, leading to a narrowed lumen. This results in reduced blood flow, increased blood pressure, and a higher risk of clot formation and reduced tissue perfusion.
Card 78
Which of the following best describes the function of the SA node in the heart's conduction system? A. It fires impulses at 40-60 impulses/min and is located at the atria-ventricle junction. B. It is the heart's natural pacemaker, firing 70-80 impulses/min, and is located in the right atrium. C. It ensures blood flows in one direction only by opening and closing heart valves. D. It is an artificial device that replaces the heart's natural impulse.
B. The SA node (sinoatrial node) is located in the right atrium and serves as the heart's natural pacemaker, firing impulses at a rate of 70-80 impulses/min. This initiates the electrical activity for each heartbeat.
Card 79
During which phase of the cardiac cycle do the ventricles contract and pump blood into the aorta? A. Atrial systole. B. Ventricular systole. C. Diastole. D. Relaxation.
B. Ventricular systole is the phase during which the ventricles contract. This contraction increases pressure within the ventricles, causing blood to be pumped into the pulmonary trunk from the right ventricle and into the aorta from the left ventricle.
Card 80
Which of the following is a primary function of the integumentary system related to cardiovascular interaction? A. Producing digestive enzymes. B. Transporting white blood cells and immune signals throughout the body. C. Regulating body temperature through vasodilation and vasoconstriction. D. Filtering blood to remove waste products.
C. The integumentary system interacts with the cardiovascular system to regulate body temperature. Vasodilation allows more blood near the skin surface to release heat, while vasoconstriction conserves heat by reducing blood flow to the skin.
Card 81
What is the primary role of the Aorta in the cardiovascular system? A. To return deoxygenated blood from the upper body to the right atrium. B. To carry deoxygenated blood from the right ventricle to the lungs. C. To distribute oxygenated blood from the left ventricle to the body. D. To receive deoxygenated blood from tissues.
C. The Aorta is the largest artery in the body, responsible for distributing oxygenated blood from the left ventricle to the systemic circulation, supplying the entire body with oxygen and nutrients.
Card 82
What is the definition of a myocardial infarction? A. Chest pain resulting from reduced blood flow to the myocardium. B. A build-up of fatty plaques in arterial walls. C. Heart muscle death due to oxygen deprivation from a full blockage of a coronary artery. D. A complex syndrome where the heart cannot pump enough blood to meet metabolic demands.
C. A myocardial infarction, commonly known as a heart attack, occurs when heart muscle tissue dies due to prolonged oxygen deprivation, typically caused by a complete blockage of a coronary artery.
Card 83
Which of the following medications is primarily used to lower LDL cholesterol and slow plaque progression in atherosclerosis? A. Diuretics. B. Beta blockers. C. Statins. D. Antiplatelet drugs.
C. Statins are a class of medications specifically prescribed to lower LDL (low-density lipoprotein) cholesterol levels. By doing so, they help to slow the progression of atherosclerotic plaque formation in arterial walls.
Card 84
Where is the heart primarily located within the body? A. In the abdominal cavity, behind the liver. B. In the central thoracic cavity, behind and to the left of the sternum, between the lungs. C. In the cranial cavity, superior to the brainstem. D. In the lumbar region, anterior to the spinal column.
B. The heart is located in the mediastinum, which is the central part of the thoracic cavity. It sits behind and slightly to the left of the sternum, nestled between the two lungs.
Card 85
What is the primary function of the Right Coronary Artery (RCA)? A. Supplies the left atrium and lateral wall of the left ventricle. B. Supplies the front of the heart and interventricular septum. C. Supplies the right atrium and right ventricle. D. Divides into the Left Anterior Descending and Circumflex arteries.
C. The Right Coronary Artery (RCA) is responsible for supplying blood to the right atrium and the right ventricle. It also gives off a marginal branch and contributes to the posterior descending artery.
Card 86
Which of the following symptoms is NOT typically associated with heart failure? A. Tiredness. B. Shortness of breath. C. Pulmonary oedema. D. Increased cardiac output.
D. Heart failure is characterized by the heart's inability to pump enough blood, leading to reduced cardiac output, not increased cardiac output. Symptoms like tiredness, shortness of breath, and pulmonary oedema are common due to poor oxygen and nutrient delivery.
Card 87
What is the role of the fibrous and serous layers of the pericardium? A. To form the inner lining of the heart chambers. B. To provide the cardiac muscle for contraction. C. To act as the outer protective sac for the heart. D. To separate the right and left ventricles.
C. The pericardium, composed of fibrous and serous layers, serves as the outer protective sac for the heart. It anchors the heart, prevents overfilling, and reduces friction during heartbeats.
Card 88
How does the cardiovascular system contribute to the function of the immune system? A. By producing white blood cells and immune signals. B. By transporting white blood cells and immune signals. C. By filtering pathogens from the blood. D. By regulating the production of antibodies.
B. The cardiovascular system plays a crucial role in the immune system by transporting white blood cells, which are key components of the immune response, and immune signals (like cytokines) throughout the body to sites of infection or injury.
Card 89
Which of the following surgical interventions involves creating a new blood route around a blocked artery? A. Angioplasty. B. Stent placement. C. Coronary Artery Bypass Graft (CABG). D. Artificial pacemaker implantation.
C. A Coronary Artery Bypass Graft (CABG) is a surgical procedure where a healthy blood vessel from another part of the body is used to create a new pathway, bypassing a blocked or narrowed coronary artery to restore blood flow to the heart muscle.
Card 90
What is the primary function of the pulmonary trunk? A. To return deoxygenated blood from the upper body to the right atrium. B. To carry deoxygenated blood from the right ventricle to the lungs. C. To distribute oxygenated blood from the left ventricle to the body. D. To receive oxygenated blood from the lungs.
B. The pulmonary trunk carries deoxygenated blood from the right ventricle to the lungs. Here, the blood will release carbon dioxide and pick up oxygen before returning to the left side of the heart.
Card 91
Which risk factor for heart failure directly causes increased cardiac strain, leading to progressive weakening or stiffening of the myocardium? A. Healthy diet. B. Regular exercise. C. Hypertension. D. Weight management.
C. Hypertension (high blood pressure) is a significant risk factor for heart failure because it increases the workload on the heart. This sustained increased cardiac strain can lead to progressive weakening and stiffening of the myocardium, reducing the heart's pumping efficiency.
Card 92
What is the main difference between eccrine and apocrine sweat glands? A. Eccrine glands are located in the armpits and groin, while apocrine glands are found throughout the body. B. Eccrine glands produce a thicker secretion, while apocrine glands produce watery sweat. C. Eccrine glands open onto the skin surface for thermoregulation, while apocrine glands open into hair follicles and are active at puberty, contributing to body odour. D. Eccrine glands are active at puberty, while apocrine glands function from birth.
C. Eccrine sweat glands are located throughout the body, open directly onto the skin surface, and produce watery sweat primarily for thermoregulation. Apocrine glands are found in specific areas like armpits and groin, open into hair follicles, become active at puberty, and their thicker secretion contributes to body odour after bacterial breakdown.
Card 93
How does the nervous system interact with the cardiovascular system? A. By transporting oxygen from the lungs to the heart. B. By controlling heart rate and vessel diameter. C. By delivering blood to the kidneys for filtration. D. By carrying absorbed nutrients from the intestines.
B. The nervous system exerts significant control over the cardiovascular system. It regulates heart rate through sympathetic and parasympathetic innervation and controls vessel diameter (vasodilation and vasoconstriction) to adjust blood flow and pressure.
Card 94
What is the primary consequence of a blockage in a coronary artery, such as the LAD? A. Increased blood flow to the myocardium. B. Reduced oxygen supply to the myocardium, leading to angina or myocardial infarction. C. Enhanced nutrient delivery to the heart muscle. D. Strengthening of the heart muscle.
B. A blockage in a coronary artery significantly reduces the oxygen supply to the myocardium (heart muscle). This can result in angina (chest pain due to reduced flow) or, if severe and prolonged, a myocardial infarction (heart attack) due to tissue death.
Card 95
Which of the following describes the function of the Left pump of the heart? A. Receives deoxygenated blood from tissues and sends it to pulmonary circulation. B. Receives oxygenated blood from lungs and pumps it to systemic circulation. C. Returns deoxygenated blood from the upper body to the right atrium. D. Carries deoxygenated blood from the right ventricle to the lungs.
B. The left pump of the heart, consisting of the left atrium and left ventricle, receives oxygenated blood from the lungs and is responsible for pumping this blood into the aorta for distribution to the entire systemic circulation of the body.
Card 96
What is the role of the Hypodermis layer of the skin? A. Outer protective layer containing keratinocytes and melanocytes. B. Contains blood vessels, nerves, hair follicles, and glands. C. Provides insulation and cushioning with fat and connective tissue. D. Responsible for producing vitamin D.
C. The hypodermis, also known as the subcutaneous layer, is composed of fat and connective tissue. Its primary functions are insulation, cushioning, and storing energy.
Card 97
Which of the following best describes the 'key principle' governing heart valve function? A. Valves open and close due to nerve impulses from the SA node. B. Valves open and close due to pressure differences, ensuring unidirectional blood flow. C. Valves are controlled by the nervous system to regulate heart rate. D. Valves open and close to allow mixing of oxygenated and deoxygenated blood.
B. The key principle governing heart valve function is that they open and close in response to pressure differences across the chambers. This mechanism is crucial for ensuring that blood flows in one direction only, preventing backflow and maintaining efficient circulation.
Card 98
How does vasodilation in the skin contribute to temperature regulation? A. It reduces blood flow near the skin, conserving heat. B. It increases blood flow near the skin, allowing more heat to be lost to the environment. C. It causes the skin to look pale, indicating heat conservation. D. It activates sweat glands directly to produce sweat.
B. Vasodilation involves the widening of dermal blood vessels, which increases blood flow to the surface of the skin. This allows more heat to dissipate from the body into the environment, thus helping to cool the body down and making the skin appear red.
Card 99
Which component of the integumentary system is made of keratin, protects fingertips, and aids fine manipulation? A. Hair. B. Sweat glands. C. Nails. D. Sebaceous glands.
C. Nails are composed of keratin and are a vital part of the integumentary system. They serve to protect the fingertips and toes, and also aid in fine manipulation and grasping objects.
Card 100
What immediate event occurs when body temperature rises, triggering the negative feedback loop for thermoregulation? A. Hypothalamus activates sweat glands and vasoconstriction. B. Hypothalamus activates sweat glands and vasodilation. C. Blood flow near the skin decreases. D. Heat is conserved by the body.
B. When body temperature rises, the hypothalamus, the body's thermostat, activates sweat glands to produce sweat and initiates vasodilation. This increases blood flow to the skin surface, allowing heat to be lost through sweat evaporation and radiation, returning the temperature to 37 degrees Celsius.
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