ATI LPN
PN Learning System Medical Surgical Endocrine Practice Quiz Questions
Question 1 of 5
Melatonin is involved with circadian rhythms.
Correct Answer: A
Rationale: Melatonin helps synchronize the body's day-night cycle.
Question 2 of 5
A 38-year-old man who has galactorrhea is found to have a prolactinoma. His physician treats him with bromocriptine, which eliminates the galactorrhea. The basis for the therapeutic action of bromocriptine is that it
Correct Answer: C
Rationale: Bromocriptine is a dopamine agonist. The secretion of prolactin by the anterior pituitary is tonically inhibited by the secretion of dopamine from the hypothalamus. Thus, a dopamine agonist acts just like dopamine "it inhibits prolactin secretion from the anterior pituitary.
Question 3 of 5
The specificity of hormones is due to
Correct Answer: D
Rationale: Hormone specificity arises from receptors on target cells that recognize specific hormone structures.
Question 4 of 5
Which class of hormones are polar and, accordingly, hydrophilic?
Correct Answer: D
Rationale: Peptides (e.g., insulin) and catecholamines (e.g., epinephrine) are polar and water-soluble.
Question 5 of 5
Which of the following is least associated with the hydrophilic hormones?
Correct Answer: D
Rationale: Hydrophilic hormones use membrane receptors and second messengers, not intracellular receptors.