Which hormone is associated with the wake-sleep cycle?
A) epinephrine
B) melatonin
C) thyroid hormone
D) testosterone
B
Explanation: A) Epinephrine is associated with the fight-or-flight response, not the wake-sleep cycle.
B) Correct! Melatonin from the pineal gland is associated with the wake-sleep cycle.
C) Thyroid hormone is associated with body metabolism, not the wake-sleep cycle.
D) Testosterone is associated with the male sexual characteristics, not the wake-sleep cycle.
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