Viagra is a drug used to treat erectile dysfunction by dilating arteries in the penis. The neurotransmitter that Viagra affects is
A)acetylcholine.
B)nitric oxide.
C)serotonin.
D)histamine.

Question

Quizplus · Accepted Answer

Viagra acts by inhibiting the enzyme phosphodiesterase type 5 (PDE5), which breaks down cyclic guanosine monophosphate (cGMP) in the penis. cGMP is responsible for relaxing smooth muscle cells in blood vessels, allowing vasodilation (dilation of blood vessels) and increased blood flow to the penis, resulting in an erection. Nitric oxide (NO) is a crucial signaling molecule that stimulates the production of cGMP, and Viagra enhances its activity by preventing its breakdown by PDE5.

Viagra Is a Drug Used to Treat Erectile Dysfunction by Dilating