비아그라에 대한 이 보고서 검토

Sexual stimulation that leads to an erection causes the production and launch of nitric oxide during the penis. Nitric oxide results in an enzyme, guanylate cyclase, to generate cyclic guanosine monophosphate (cGMP) that may be principally to blame for escalating and decreasing the scale of blood vessels carrying blood to and from your penis and cr