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Desiree Is Having Difficulty Sleeping

Question 83

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

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