Which of the following occurs during an erection?
A) The sympathetic nervous system constricts the veins leaving the penis.
B) Blood fills the corpora spongiosum, causing it to engorge.
C) The veins of the corpora cavernosa dilate.
D) The parasympathetic nervous system dilates the arteries going into the penis.

Question

Quizplus · Accepted Answer

During an erection, the parasympathetic nervous system dilates the arteries going into the penis, allowing more blood to flow into the corpora cavernosa and leading to engorgement and an erection. The sympathetic nervous system constricts the veins leaving the penis to help maintain the erection once it has occurred. The corpora spongiosum does not fill with blood during an erection - this structure surrounds the urethra and does not contribute to erectile function.

Which of the Following Occurs During an Erection