A 58-year-old man visits your office and complains about impotence. Upon questioning you learn that he is capable of erections, but that they do not last as long and that they are of lesser strength than previously. Which of the following neurotransmitters is primarily responsible for dilation of the penile artery during erections?
A) acetylcholine
B) epinephrine
C) GABA
D) nitric oxide
E) norepinephrine
Correct Answer:
Verified
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