비아그라에 대한 사실 아무도 제안하지 않는다

Sexual stimulation that contributes to an erection brings about the manufacturing and release of nitric oxide within the penis. Nitric oxide leads to an enzyme, guanylate cyclase, to produce cyclic guanosine monophosphate (cGMP) that is definitely primarily accountable for escalating and decreasing the size of blood vessels carrying blood to and th