Mechanism of Erection

Erection is a complex process that begins with impulses of sexual arousal at the brain centers of sexual excitement. The impulses travel along nerves from the brain to the penis, where they cause secretion of a substance called nitric oxide. Nitric oxide sends signals that cause dilatation of blood vessels and increase blood flow to the penis. It is estimated that during the early stages of erection, the blood flow in the penis increases 2,000 percent to 4,000 percent. This increase in blood flow, along with the relaxation of the smooth muscles of the penis, causes the penis to increase in length and diameter (engorgement). The veins that normally drain the blood away from the penis are closed during erection. Any disturbance in the whole chain of events can contribute to erectile dysfunction.

Dealing With Erectile Dysfunction

Dealing With Erectile Dysfunction

Whether you call it erectile dysfunction, ED, impotence, or any number of slang terms, erection problems are something many men have to face during the course of their lifetimes.

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