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HAP CARDIO+INTERG+RESPIRATORY flashcards
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Card 1
Which of the following describes the primary difference in communication speed between the nervous and endocrine systems?
A. The nervous system allows rapid transmission of communication, while the endocrine system relies on widespread, longer-lasting regulatory actions. The nervous system uses electrical signals for quick responses, whereas the endocrine system uses hormones transported via the bloodstream for more sustained effects.
Card 2
Steroid hormones interact with target cells differently than protein hormones. Which statement correctly describes this difference?
C. Steroid hormones can enter target cells and interact with receptors inside the cytoplasm and nucleus, while protein hormones interact with receptors on the cell surface. This is because steroid hormones are lipid-soluble and can pass through the cell membrane, unlike proteins and polypeptides.
Card 3
A patient presents with symptoms including decreased metabolism, weight gain, constipation, and drowsiness. Which endocrine disorder is most consistent with these symptoms?
B. Hypothyroidism. These symptoms are characteristic of a low metabolic rate, which is caused by insufficient production of thyroid hormones (T3 and T4).
Card 4
Which of the following functions is primarily regulated by the endocrine system, as opposed to the nervous system?
D. Metabolism and tissue maturation. While the nervous system transmits signals between the brain and body, the endocrine system is responsible for broader, long-term regulatory actions like metabolism, growth, and ion regulation.
Card 5
What is the primary role of the parathyroid hormone (PTH) in the body?
A. Regulates calcium levels by increasing bone resorption and calcium absorption. PTH is crucial for maintaining calcium homeostasis, stimulating osteoclasts to release calcium from bones and promoting vitamin D3 activation for intestinal calcium uptake.
Card 6
Which hormone is responsible for regulating circadian rhythms and reproductive hormones?
B. Melatonin. The pineal gland produces melatonin, which plays a key role in controlling sleep-wake cycles and influencing reproductive functions.
Card 7
A patient is diagnosed with acromegaly. This condition is characterized by:
A. Excess growth hormone (GH) in adulthood. Acromegaly results from the overproduction of growth hormone after the growth plates have fused, leading to enlarged hands, feet, and facial features.
Card 8
Which of the following is a function of the hypothalamus?
C. Controls appetite, sexual behaviour, and emotional responses. The hypothalamus is a critical brain region that maintains homeostasis and regulates various physiological cycles and behaviours.
Card 9
Down-regulation of receptors leads to:
B. A decrease in receptor numbers, reducing cell sensitivity. This mechanism, exemplified by insulin resistance, means that target cells become less responsive to a given hormone concentration.
Card 10
Which gland secretes hormones that regulate metabolic rate, protein synthesis, and glucose metabolism?
D. Thyroid gland. The thyroid produces T3 and T4, which are essential for controlling the body's metabolic processes.
Card 11
The neuroendocrine system controls several functions. Which of the following is NOT listed as a function controlled by the neuroendocrine system?
D. Direct transmission of sensory input from skin to brain. While the nervous system handles sensory input, the neuroendocrine system's control extends to motor movements, language, emotional and cognitive behaviors, and sociosexual functions.
Card 12
What is the primary function of ADH (vasopressin) secreted by the posterior pituitary lobe?
C. Regulates water conservation. ADH increases water reabsorption in the kidneys, helping to maintain fluid balance, especially in response to high plasma osmolarity or low plasma volume.
Card 13
Which pair of hormones is produced by the pancreas to regulate plasma glucose levels?
A. Insulin and glucagon. Insulin lowers blood glucose by promoting uptake and storage, while glucagon raises it by stimulating glucose release.
Card 14
A non-cancerous tumor producing prolactin is known as a:
B. Prolactinoma. This is a specific type of pituitary disorder where a tumor leads to excessive prolactin secretion.
Card 15
Which of the following is a characteristic of neuroendocrine cells?
A. They are hybrid cells with features of both neurons and endocrine cells. Neuroendocrine cells receive nervous signals and respond by secreting hormones, bridging the gap between the two communication systems.
Card 16
The physiological effect of a hormone is directly related to:
D. Its plasma concentration and number of active receptors. Both the amount of hormone available and the responsiveness of target cells determine the overall impact of a hormone.
Card 17
What is the primary function of the thymus gland?
B. Makes white blood cells for immune defence. The thymus is crucial for the maturation of T-lymphocytes, which are vital components of the immune system.
Card 18
Which hormone promotes anabolic processes, skeletal muscle growth, and reproductive function in males?
A. Androgens (e.g., testosterone). These hormones, primarily secreted by the testes, are responsible for male secondary sexual characteristics and muscle development.
Card 19
Cretinism is a disorder caused by:
C. Hyposecretion of thyroid hormones during development. This condition leads to severe mental retardation and short stature if not treated early.
Card 20
Which of the following factors does NOT influence the concentration of hormones in plasma?
D. Rate of nerve impulse transmission. Hormone concentration is affected by secretion, metabolism/excretion, transport proteins, and plasma volume, not directly by nerve impulse speed.
Card 21
Growth hormone (GH) acts as a potent anabolic agent by:
A. Promoting muscle hypertrophy and sparing plasma glucose. GH stimulates protein synthesis and amino acid uptake, contributing to muscle growth, and also influences nutrient levels during fasting and exercise.
Card 22
Which endocrine gland is responsible for the 'fight or flight' response through the secretion of adrenaline and noradrenaline?
C. Adrenal glands. The adrenal medulla specifically releases these catecholamines as part of the body's stress response.
Card 23
Diabetes mellitus is a metabolic disorder characterized by:
B. High plasma glucose due to insulin secretion or action defects. This condition results from the body's inability to produce enough insulin or to properly use the insulin it produces, leading to elevated blood sugar levels.
Card 24
Up-regulation of receptors refers to:
A. An increase in receptor numbers, enhancing cell sensitivity. This mechanism allows target cells to become more responsive to lower concentrations of a hormone.
Card 25
Which of the following pituitary disorders is characterized by excess ACTH?
B. Cushing disease/syndrome. This condition results from overproduction of ACTH, often due to a pituitary tumor, leading to excessive cortisol secretion from the adrenal glands.
Card 26
Which of the following hormones is primarily responsible for regulating water conservation in the body?
A. ADH (Antidiuretic Hormone). ADH is secreted by the posterior pituitary gland and plays a crucial role in regulating water balance by promoting water reabsorption in the kidneys.
Card 27
Which of the following describes the primary function of parathyroid hormone (PTH)?
C. Increasing calcium release from bones. PTH is crucial for calcium regulation; it stimulates osteoclasts to release calcium from bones and also activates vitamin D3 for intestinal calcium absorption.
Card 28
The pineal gland is known for producing which hormone, essential for regulating circadian rhythms?
A. Melatonin. The pineal gland produces melatonin, which is vital for controlling sleep-wake cycles and other circadian rhythms.
Card 29
Which of the following is a primary function of the thymus gland?
B. Producing lymphocytes for immune defense. The thymus is responsible for the maturation of T-lymphocytes, which are critical components of the immune system.
Card 30
Insulin, produced by the pancreas, has multiple roles in glucose and nutrient metabolism. Which of the following is NOT a direct action of insulin?
D. Inhibiting protein synthesis. Insulin actually promotes amino acid uptake and protein synthesis, in addition to facilitating glucose uptake and inhibiting gluconeogenesis.
Card 31
Neuroendocrine cells are unique because they possess features of both neurons and endocrine cells. Which of the following accurately describes their function?
A. They receive nervous signals and respond by secreting hormones. These hybrid cells bridge the nervous and endocrine systems, translating neural input into hormonal output.
Card 32
Which of the following is a common physical symptom that might suggest an endocrine disorder?
C. Abnormal hair growth. Endocrine disorders can manifest with various physical symptoms, including anxiety, muscle weakness, fatigue, and abnormal hair growth, among others.
Card 33
Anatomy is the study of the physical structure of the body. What does physiology primarily focus on?
B. The body's functions and how systems integrate. Physiology investigates how the body works, including the mechanisms by which different systems interact and contribute to overall function.
Card 34
Homeostasis is a central theme in physiology. Which body system is primarily responsible for rapid, immediate control in maintaining homeostasis?
A. Nervous system. The nervous system provides quick, short-term responses to maintain internal stability, contrasting with the slower, long-term regulation of the endocrine system.
Card 35
When physiological adjustments fail to compensate for stressors like infection or injury, leading to a diseased state, what is this process called?
D. Decompensation. Decompensation occurs when the body's homeostatic mechanisms are overwhelmed and can no longer maintain stable internal conditions, resulting in pathology.
Card 36
Which body system is primarily responsible for breaking down food into absorbable nutrients and removing undigested waste?
C. Digestive system. The digestive system processes food, extracting nutrients for the body and eliminating waste products.
Card 37
The muscular system comprises different types of muscle tissues. Which type is characterized by branched, striated cells interconnected by intercalated discs?
B. Cardiac muscle. Cardiac muscle tissue, found in the heart, has these specific structural features that enable its rhythmic, involuntary contractions.
Card 38
In the hierarchical organization of muscle, what connective tissue sheath surrounds a whole muscle?
A. Epimysium. The epimysium is the outermost connective tissue layer that encloses the entire muscle, providing structural integrity.
Card 39
Which of the following blood components is primarily responsible for the body's immune/security response?
C. White blood cells. White blood cells (leukocytes) are crucial for defending the body against pathogens and other foreign invaders.
Card 40
Arteries are described as large, high-pressure, thick-walled vessels. What is their main function?
A. Carry blood away from the heart fast. Arteries are designed to rapidly transport oxygenated blood from the heart to the rest of the body under high pressure.
Card 41
Which type of blood vessel is the primary site for the exchange of oxygen, nutrients, and waste products between blood and tissues?
C. Capillary. Capillaries have one-cell thick walls, are very narrow, and form extensive networks, making them ideal for efficient substance exchange.
Card 42
At the arteriole end of a capillary bed, what process is driven by high pressure, pushing fluid out into the tissues?
B. Filtration. High hydrostatic pressure at the arteriole end forces fluid, along with oxygen and nutrients, out of the capillaries into the interstitial fluid.
Card 43
The cardiovascular system is interconnected with many other body systems. Which system supplies oxygen and nutrients necessary for muscle contraction?
B. Muscular system. The cardiovascular system delivers the vital oxygen and nutrients that the muscular system requires to generate force and movement.
Card 44
The heart is located in the mediastinum. Which of the following accurately describes the mediastinum's position?
A. Central thoracic cavity, behind/left of the sternum, between the lungs. This description correctly places the heart within the chest cavity.
Card 45
Which of the following is the middle layer of the heart wall, primarily composed of cardiac muscle?
B. Myocardium. The myocardium is the thick, muscular layer responsible for the heart's pumping action.
Card 46
Growth Hormone (GH) from the anterior pituitary gland acts as an anabolic agent. Which of the following is a direct effect of GH?
D. Promoting muscle hypertrophy. GH stimulates protein synthesis and amino acid uptake, leading to increased muscle mass and strength.
Card 47
Goitre is an endocrine disorder characterized by thyroid enlargement. What is the most common cause of goitre?
C. Iodine deficiency. Insufficient iodine intake prevents the thyroid from producing enough hormones, leading to compensatory enlargement of the gland.
Card 48
The renal system plays a crucial role in homeostasis. Which of the following is a primary homeostatic function of the renal system?
D. Regulation of water, salts, pH, and blood pressure. The kidneys are essential for maintaining fluid and electrolyte balance, acid-base balance, and blood pressure.
Card 49
Which of the following accurately describes the function of platelets in the blood?
D. Clotting/emergency repair. Platelets are cell fragments that play a vital role in hemostasis, forming plugs to stop bleeding at injury sites.
Card 50
Which of the following describes the primary function of arterioles in the cardiovascular system? A. Carrying blood away from the heart at high pressure. B. Facilitating the exchange of oxygen and nutrients with tissues. C. Controlling blood flow to tissues through vasoconstriction and vasodilation. D. Returning deoxygenated blood to the heart.
C. Arterioles are smaller vessels with smooth muscle gates that can vasoconstrict or vasodilate, thereby controlling the amount of blood flow delivered to specific tissues.
Card 51
A patient is diagnosed with a blockage in the Left Anterior Descending (LAD) artery. What immediate consequence is most likely to occur? A. Reduced blood flow to the right atrium and right ventricle. B. Impaired oxygen delivery to the front of the heart and interventricular septum. C. Decreased oxygenated blood distribution from the left ventricle to the body. D. Inability of the right pump to send deoxygenated blood to the lungs.
B. The Left Anterior Descending (LAD) artery supplies the front of the heart and the interventricular septum. A blockage here would reduce oxygen delivery to these specific areas, potentially leading to a myocardial infarction.
Card 52
Which of the following accurately describes the primary role of the SA node in the cardiac conduction system? A. It acts as a backup pacemaker, firing at 40-60 impulses/min. B. It ensures blood flows in one direction only through valve regulation. C. It serves as the heart's natural pacemaker, initiating impulses at 70-80 impulses/min. D. It causes the ventricles to contract and pump blood into the aorta.
C. The SA node, located in the right atrium, is the heart's natural pacemaker, firing electrical impulses at a rate of 70-80 impulses per minute to initiate the heartbeat.
Card 53
During the cardiac cycle, what event occurs immediately after atrial systole? A. The heart relaxes and the ventricles refill with blood. B. The ventricles contract, and blood is pumped into the aorta. C. The SA node fires, initiating the next heartbeat. D. Fluid is pushed out into tissues at the arteriole end of capillaries.
B. Atrial systole involves the atria contracting to push blood into the ventricles. Immediately following this, the ventricles contract during ventricular systole, causing pressure to rise and blood to be pumped into the aorta.
Card 54
A patient presents with symptoms including tiredness, shortness of breath, and ankle swelling. These symptoms are most indicative of which cardiovascular pathology? A. Atherosclerosis B. Myocardial infarction C. Heart failure D. Angina
C. Tiredness, shortness of breath, and oedema (like ankle swelling) are classic symptoms of heart failure, a complex syndrome where the heart cannot pump enough blood to meet metabolic demands.
Card 55
Which of the following treatments for atherosclerosis primarily works by lowering LDL cholesterol and slowing plaque progression? A. Angioplasty B. Aspirin C. Statins D. Coronary artery bypass graft (CABG)
C. Statins are medications specifically designed to lower LDL cholesterol levels, which helps to slow the progression of plaque buildup in arterial walls, a key aspect of atherosclerosis management.
Card 56
What is the primary function of the hypodermis layer of the skin? A. Protection against external damage and UV radiation. B. Housing blood vessels, nerves, and hair follicles. C. Insulation and cushioning due to its fat and connective tissue content. D. Production of keratinocytes and melanocytes.
C. The hypodermis, composed of fat and connective tissue, primarily serves for insulation and cushioning, providing a protective and energy-storing layer beneath the dermis.
Card 57
How does the cardiovascular system contribute to temperature regulation when the body temperature rises? A. Vasoconstriction occurs, leading to less blood near the skin and heat conservation. B. Vasodilation occurs, allowing more blood near the skin for heat loss to the environment. C. Platelets clot to limit blood loss and conserve heat. D. The heart rate decreases to reduce metabolic heat production.
B. When body temperature rises, the hypothalamus activates vasodilation in the skin's blood vessels. This brings more blood closer to the surface, allowing heat to be lost to the environment, often making the skin appear red.
Card 58
Which type of sweat gland is primarily involved in thermoregulation and produces a watery secretion? A. Apocrine glands B. Sebaceous glands C. Eccrine glands D. Ceruminous glands
C. Eccrine sweat glands are located throughout the body, open onto the skin surface, and produce a watery sweat primarily for thermoregulation (cooling) through evaporation.
Card 59
The integumentary system's extensive vascular network can act as a temporary blood reservoir. What is the main implication of this function? A. It helps in the production of new blood cells. B. It aids in the regulation of systemic circulation. C. It directly contributes to the immune response. D. It is essential for vitamin D synthesis.
B. The skin's extensive vascular network can act as a temporary blood reservoir, which helps in regulating systemic circulation by adjusting the amount of blood available to other parts of the body as needed.
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