Part of the physiological process of erection includes the parasympathetic nervous system causing the release of nitric oxide (NO) in the corpus cavernosum of the penis. NO binds to the receptors of the enzyme guanylate cyclase, resulting in increased levels of cyclic guanosine monophosphate (cGMP), leading to a relaxation of cavernous smooth muscle by vasodilation of the helicine arteries inside the penis. Vasodilation increases the blood flow inside the penis, thus causing the Robert F. ere...
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