Erectile Dysfunction (ED) 
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Erection: What happens mormally ? 
Achieving a normal erection is a complex process involving psychological impulses from the brain, adequate levels of the male sex hormone testosterone, a functioning nervous system, and adequate and healthy vascular tissue in the penis.
An erection occurs when blood is pumped into the penis and stays there, making it hard. It generally happens because a man is thinking about sex, or because his penis is being stimulated - or both.
The result is that signals go down the nerves that lead from his spinal cord to his genitals. They tell the blood vessels which supply the penis to open up. Blood flows in and the organ ‘blows up’ . A valve mechanism near the base of the penis keeps the blood from flowing out again – a least, until sex is over.
The choices we make in life can lead to degeneration of the erectile tissue and the development of ED. Smoking, drug or alcohol abuse, particularly over a long period of time, will compromise the blood vessels of the penis. Lack of exercise and a sedentary lifestyle will contribute to the development of ED. Correction of these conditions will contribute to overall health and may in some individuals correct mild ED.
Since an erection requires a precise sequence of events, ED can occur when any of the events is disrupted. The sequence includes nerve impulses in the brain, spinal column, and area around the penis, and response in muscles, fibrous tissues, veins, and arteries in and near the corpora cavernosa.
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