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At the onset of erection, an increase in                            ...

At the onset of erection, an increase in                             [ Select ]                       ["somatic", "sympathetic", "parasympathetic"]         stimulation to the male organ leads to local secretion of                            [ Select ]                       ["acetylcholine (ACh)", "norepinephrine (NE)", "nitric oxide (NO)", "testosterone (T)"]         , a potent vasodilator.

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