Which gland secretes melatonin and is regulated by the body's biological rhythm?
Adrenal gland
Pineal gland
Pituitary gland
Pancreas
The Correct Answer is B
A. Adrenal gland: Produces cortisol and adrenaline; not melatonin.
B. Pineal gland: Secretes melatonin; controls circadian rhythms.
C. Pituitary gland: Master gland; does not secrete melatonin.
D. Pancreas: Produces insulin and glucagon; unrelated to sleep regulation.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is C
Explanation
A. Immediately after menstruation: The egg is not yet released.
B. Day 28 of a 28-day cycle: This is typically the start of a new cycle, not when ovulation occurs.
C. Around ovulation (midcycle) :This is the window of highest fertility.
D. Immediately before menstruation: The egg would have already degenerated if not fertilized.
Correct Answer is A
Explanation
A. Low blood volume and hypotension: Aldosterone promotes sodium and water retention; its deficiency leads to fluid loss and low BP.
B. High blood pressure: Aldosterone excess, not deficiency, would raise BP.
C. Low blood potassium levels: Aldosterone promotes potassium excretion; deficiency would raise potassium levels.
D. Goiter formation: Goiter is associated with thyroid dysfunction, not aldosterone.
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