Ejaculation is controlled by a reflex arc that involves several nerves and neurotransmitters. The final neurotransmitter in this arc that directly stimulates the contraction of the muscularis of the male tract is:

A. acetylcholine
B. nitric oxide
C. oxytocin
D. norepinephrine
E. somatostatin


ANS: D

Anatomy & Physiology

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