How does Viagra Work
In the genital organs enters the blood, pump the heart. Once the surrounding tissue will learn the necessary share of nutrients and oxygen, the spent blood goes through the veins, constantly opening the way for new blood to the masses. But, it is supplied under much greater pressure than the usual, so tissue loses softness and become stronger and not as elastic. Blood starts to put pressure on the veins diverting they narrowed, but do not overlap completely.When in the cavernous bodies recruited a lot of blood, but as much and comes to their blood, and the same amount is given back into the bloodstream - the erection is maintained at. An erection occurs, and it depended on the blood flow into the penis. Physiological mechanism that ensures an erection is not possible without separation of nitric oxide. Nitric oxide activates the action of the enzyme guanylate cyclase. This enzyme reacts and increases the level of another enzyme, which is responsible for muscle relaxation and increased blood flow to the male genitalia.
Sildenafil generic viagra is used in its composition and chemical components that add nitric oxide to the cavernous bodies and, therefore, better muscles relax and blood flow increases. Sildenafil - a selective inhibitor of PDE5 (phosphodiesterase type 5), which is responsible for the breakdown of cGMP enzyme, so it can control blood filling the penis.