When the penis is _______, activity is high in the sympathetic fibers; when the penis is _______, activity is high in the parasympathetic fibers.

Question

Quizplus · Accepted Answer

During sexual arousal, the parasympathetic nervous system is responsible for causing an erection by increasing blood flow to the penis. Conversely, the sympathetic nervous system is more active when the penis is flaccid, controlling the process of ejaculation and returning the penis to its flaccid state after sexual activity.

When the Penis Is _______, Activity Is High in the Sympathetic