What function have cholinergic nerves in the smooth muscle of the male genital tract?
D002799:Cholinergic Fibers / Q000502:physiology*; D004558:Electric Stimulation; D005837:Genitalia, Male / Q000294:innervation*; D006801:Humans; D008297:Male; D009119:Muscle Contraction; D009130:Muscle, Smooth / Q000294:innervation*