비아그라에 대한 5가지 쉬운 사실 설명

비아그라에 대한 5가지 쉬운 사실 설명

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비아그라에 대해 거의 알려지지 않은 사실

Sexual stimulation that causes an erection brings about the generation and launch of nitric oxide from the penis. Nitric oxide causes an enzyme, guanylate cyclase, to generate cyclic guanosine monophosphate (cGMP) which is largely accountable for expanding and reducing the size of blood vessels carrying blood to and in the penis and causing an erec

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