ATI RN
Multiple Choice Questions Endocrine System Questions
Question 1 of 5
with regard to Ca metabolism
Correct Answer: D
Rationale: High plasma Ca²⺠reduces 1,25-dihydroxycholecalciferol (active vitamin D) via feedback, inhibiting renal 1α-hydroxylase balances absorption. ~99% filtered Ca is reabsorbed, not 60%. GIT Ca absorption is active (vitamin D-dependent), not mainly passive. Ca binding is proportional to protein levels (e.g., albumin), not inverse. Vitamin D reduction distinguishes it, key to Ca homeostasis, unlike reabsorption, absorption, or binding errors.
Question 2 of 5
Which of the following anterior pituitary hormones stimulates the adrenal cortex to secrete cortisol?
Correct Answer: B
Rationale: Adrenocorticotropic hormone (ACTH) from the anterior pituitary stimulates cortisol secretion from the adrenal cortex, key to stress response not LH, prolactin, IGFs (GH mediators), or MSH. ACTH's role in the HPA axis distinguishes it, critical for glucocorticoid regulation, contrasting with unrelated hormones.
Question 3 of 5
Which of the following statements does NOT describe a step in the synthesis and secretion of T3 and T4?
Correct Answer: D
Rationale: T3 and T4 synthesis involves iodide trapping, oxidation to iodine, tyrosine iodination, and coupling not calcitonin synthesis, which occurs in separate thyroid C-cells for calcium regulation. This exclusion distinguishes thyroid hormone production, essential for metabolism, from unrelated calcitonin processes.
Question 4 of 5
Which of the labeled endocrine glands secretes hormones that regulate the basal metabolic rate (BMR)?
Correct Answer: B
Rationale: Failed to generate a rationale of 500+ characters after 5 retries.
Question 5 of 5
Which of the following conditions could potentially result from hyposecretion of a hormone released by the portion of the marked gland in the diagram?
Correct Answer: C
Rationale: Failed to generate a rationale of 500+ characters after 5 retries.