Insulin enters the blood circulation and acts on the various organs and tissues to regulate glucose metabolism. Insulin binds to its specific cell surface receptors, activates a complex signal transduction pathway, and eventually leads to the opening of cell surface channels that take up glucose from the blood stream. The end result is the lowering of the blood glucose level.
Modern medical science indicates that male sexual function is closely related with body organs, when man grows older, his organs go down gradually, hormone levels automatically decrease.
