비아그라에 대해 알아야 할 고려 사항

Sexual stimulation that contributes to an erection brings about the generation and release of nitric oxide during the penis. Nitric oxide leads to an enzyme, guanylate cyclase, to provide cyclic guanosine monophosphate (cGMP) that is definitely principally chargeable for raising and reducing the size of blood vessels carrying blood to and in the pe