Study "HAP CARDIO+INTERG+RESPIRATORY", a flashcard deck on FORKSAI.
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.
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.
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).
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.
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.
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.
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.
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.
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.
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.