Which event occurs prior to the others during a penile erection?

Question

Quizplus · Accepted Answer

The release of nitric oxide affects the blood vessels entering the penis, which leads to vasodilation and increased blood flow to the erectile tissue. This is the earliest event that occurs during penile erection.

Answer: E
 Dilation of blood vessels entering the penis is the next event that occurs after the release of nitric oxide. This leads to increased blood flow to the erectile tissue and prepares for the filling of the erectile tissue with blood.

Which Event Occurs Prior to the Others During a Penile