First, you become sexually stimulated by Viagra or Levitra. As effect, your body releases neurotransmitters such as nitric oxide in the penile area. These are chemical messengers, telling smooth muscle cells in the erectile tissue to relax. When they relax, the central artery and other blood vessels widen, and blood rushes into the penis.
As the corpora cavernosa cialis fill with blood, the spongy tissue presses up against the veins, compressing them and preventing blood from flowing out of the penis. That produces an erection as the trapped blood straightens and stiffens the penis. When the stimulation ends, the muscles contract, pressure decreases and the penis becomes flaccid, returning to its nonerect size and shape.
This is a part of article ED treatment - effects of cialis, viagra and levitra Taken from "Cialis Viagra Levitra Effects" Information Blog
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