____ facilitates the process of erection.
a. Nitric oxide c. Peroxynitrite
b. Nitrous oxide d. Superoxide
Question 2
The term morning wood is associated with which phenomenon?
a. The phenomenon of having an erect penis, caused by a daylight stimulus to one's eyes.
b. The phenomenon of having an erect penis during REM sleep
c. The phenomenon of having an erect penis, caused by dreams of a sexual nature
d. The phenomenon of having an erect penis when heart and breathing rate are decreased