Noradrenergic transmission.
D000818:Animals; D001160:Arterioles / Q000294:innervation; D008297:Male; D009130:Muscle, Smooth / Q000502:physiology; D009638:Norepinephrine / Q000502:physiology*; D011942:Receptors, Adrenergic, alpha / Q000502:physiology; D009435:Synaptic Transmission; D014649:Vas Deferens / Q000294:innervation
D011942:Receptors, Adrenergic, alpha; D009638:Norepinephrine