Friday, May 20, 2011

What Causes Erection

What Causes Erection?

Sexual stimulation causes erection. This stimulation can be tactile or mental. Electrical impulses are generated in the nerves going to the penis due to sexual stimulation and releases nitric oxide. Further, nitric oxide increases the production of an enzyme cGMP in the corpora cavernosa (blood holding chamber of the penis). The cGMP relaxes the muscles of the corpora cavernosa, and allow blood incoming into the penis. Sufficient blood in the corpora cavernosa expands the male reproductive organ and causes erection.Many people who are suffering from erectile dysfunction buy generic viagra to get adequate flow of blood.

Erection is sustained for a required time by contracting the veins from the pressure of the expanded penis. Veins take blood away from the penis and makes men unable to erect. Other factors required for achieving erection are: a healthy nervous system that can carry well nerve impulses from the brain to the penis. Healthy arteries are also must near the corpora cavernosa. Muscles should be smooth within the corpora cavernosa. Sufficient levels of nitric oxide in the penis. Sildenafil citrate present in Generic Viagra increases the blood flow, thus causing the dessired erections.

Due to falling of cGMP levels erection becomes hard to achieve. Low cGMP contracts muscles of the penis and make them hard, and veins are expanded that pushes blood away from the penis. The levels of the cGMP fall because it is destroyed by an enzyme called phosphodiesterase type 5 (PDE5), main cause of erectile dysfunction (ED).