Erection
A) involves dilation of the arterioles supplying the sponge-like vascular spaces of the penis
B) results from cGMP production induced by nitric oxide
C) occurs when the seminiferous tubules of the penis become engorged with sperm
D) occurs in response to sympathetic nervous stimulation of the penis
E) involves dilation of the arterioles supplying the sponge-like vascular spaces of the penis, and results from cGMP production induced by nitric oxide

Question

Quizplus · Accepted Answer

Erection involves dilation of the arterioles supplying the sponge-like vascular spaces of the penis, and this is mediated by cGMP production induced by nitric oxide. Therefore, choice E is the best answer as it combines both accurate statements. The other choices are incorrect as the seminiferous tubules of the penis are not involved in erection, and sympathetic nervous stimulation actually inhibits erection.