비아그라에 대해 알려지지 않은 사실

Sexual stimulation that leads to an erection triggers the generation and launch of nitric oxide during the penis. Nitric oxide brings about an enzyme, guanylate cyclase, to supply cyclic guanosine monophosphate (cGMP) that is certainly mainly liable for escalating and decreasing the size of blood vessels carrying blood to and through the penis and