Multiple Choice
Desiree is having difficulty sleeping. She has heard of a natural substance that might help her sleep, as it naturally occurs in the brain and apparently mediates the circadian rhythm and sleep. You are sure that she is referring to __________.
A) melatonin
B) serotonin
C) endorphins
D) norepinephrine
Correct Answer:

Verified
Correct Answer:
Verified
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