Answer :
The proper erectile function requires parasympathetic stimulation with the release of nitric oxide.
The correct answer is B.
How do erections occur?
Erection is usually preceded by sexual stimulation or stimulation. This stimulation causes nerve initiation or signaling to sex organs. Signals from the brain cause the release of a chemical called nitrogen oxide in the area of the blood vessel walls of sex organs. This substance will activate the enzyme guanylate cyclase which will then hydrolyze guanosine triphosphate (GTP) into cyclic guanosine monophosphate (cGMP).
Nitrogen oxide compounds cause the smooth muscles in the blood vessels of the sex organs to relax, causing an erection. So, during the erection process, blood flow begins to fill the cavities of sex organs called the corpora cavernosa. Peak erections occur when these cavities are filled with blood
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