비아그라에 대한 이 보고서 검토

Sexual stimulation that contributes to an erection will cause the generation and launch of nitric oxide while in the penis. Nitric oxide results in an enzyme, guanylate cyclase, to produce cyclic guanosine monophosphate (cGMP) that is generally responsible for expanding and reducing the size of blood vessels carrying blood to and within the penis a

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