Show Date: 1/18/12
Monday, Feb 18th
FRIDAY, Oct. 3 (HealthDay News) -- A Chinese herbal remedy known as "horny goat weed" may indeed live up to its name as a natural version of Viagra. FRIDAY, Sept. 18 (HealthDay News) -- A topical cream for erectile dysfunction shows promise in animal testing and could become an alternative for men who can't tolerate the pill form of the drugs, U.S. researchers report. this drugstore sells viagra without prescription viagra without prescription searching for cheap viagra? canadian pharmacy viagra for sale Penile erection is managed by two different mechanisms. The first one is the reflex erection, which is achieved by directly touching the penile shaft. The second is the psychogenic erection, which is achieved by erotic or emotional stimuli. The former uses the peripheral nerves and the lower parts of the spinal cord, whereas the latter uses the limbic system of the brain. In both conditions, an intact neural system is required for a successful and complete erection. Stimulation of penile shaft by the nervous system leads to the secretion of nitric oxide (NO), which causes the relaxation of smooth muscles of corpora cavernosa (the main erectile tissue of penis), and subsequently penile erection. Additionally, adequate levels of testosterone (produced by the testes) and an intact pituitary gland are required for the development of a healthy erectile system. As can be understood from the mechanisms of a normal erection, impotence may develop due to hormonal deficiency, disorders of the neural system, lack of adequate penile blood supply or psychological problems. Restriction of blood flow can arise from impaired endothelial function due to the usual causes associated with coronary artery disease, but can also be caused by prolonged exposure to bright light.