The pineal gland secretes ________, which maintains the body's internal clock, the 24-hour wake—sleep cycle, and regulates the onset and duration of sleep
A) oxytocin
B) calcitonin
C) melatonin
D) cortisol
C
Explanation: A) The posterior pituitary gland, not the pineal gland, secretes oxytocin.
B) The thyroid gland, not the pineal gland, secretes calcitonin.
C) Correct!
D) The adrenal cortex, not the pineal gland, secretes cortisol.
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