How is the Male Penis erection sustains During Sexual Intercourse?

The veins of the penis compress the tunica albuginea or corpus cavernosum (fibrous tissue of the penis), helping to trap or capture the blood in the corpora cavernosa, thereby sustaining erection. Erection of the penis reversed when cGMP levels in the corpora cavernosa decrease, causing the smooth muscles of the corpora cavernosa to contract as a result the inflow of blood and veins that flow out blood away from the penis. The levels of the cGMP in the corpora cavernosa decrease or fall because it is damaged or ruined or destroyed by an enzyme called phosphodiesterase (PDE5) type 5.

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