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Nitric Oxide and ED

admin — Thu, 07 Aug 2008 13:17:53 +0000

The chemical, called a neurotransmitter, that is central to the erection process is nitric oxide (ironically abbreviated NO). Nitric oxide is more commonly known to most people as an air pollutant. It is often confused with nitrous oxide, more appropriately abbreviated N20, which is an anesthetic gas.
The work leading up to the discovery that NO is key to erections began in the seventies. Three different American researchers began studying arterial dilation, when the wisest of them identified NO as the chemical that signaled to smooth muscles in arterial walls to relax. It was only a matter of time before a connection to erections was made. To constant and strong erection use viagra, the most reliable medication on the market.
The connection was made when Dr. Jacob Rajfer, professor of urology at the UCLA School of Medicine, was stuck on the freight elevator at the medical school in late 1988. “It was a very slow elevator with doors that stay open too long. We’d been complaining about it for years,” he remembers. As is common among research physicians, he had been putting a lot of thought into a clinical question regarding his research interest in vascular smooth muscle. He had been trying to figure out how the vascular smooth muscle in the penis was involved in an erection when he looked through the slowly closing doors of the elevator and saw the sign to the Vascular Smooth Muscle Lab, a completely separate department from urology. “I put out my hand to stop it,” he recalls. “It was totally serendipitous.”

Erections Throughout History

admin — Thu, 07 Aug 2008 13:13:59 +0000

Our understanding of how an erection occurs has changed over the years. Aristotle believed that nerve branches carried “spirit and energy” to the penis, which caused it to inflate with air. The observance of excess penile blood in hanged men allowed Leonardo da Vinci to cast aside the air-erection theory. Based on this work, Ambrose Pare in 1585 wrote the passage above, qualifying him to be considered the first romance novelist.
In 1573, the Italian anatomist Varolio discovered the bulbocavernosus and ischiocavernosus muscles around the root of the penis. The only possible conclusion was that these muscles tightened to produce an erection. Unable to test the theory in a real person (who would want an incision made during an erection?), the idea persisted for centuries.
The early twentieth century brought several variations of a theory that “polsters” were magical, miniscule anatomical parts that caused the normal erection. These polsters were supposed to be small hydraulic pumps that miraculously knew when to open and close to allow adequate filling. This theory fell into disfavor when no one could actually find “polsters” in any dissection, microscopically, or otherwise.
We now know the process is actually fairly straightforward: the bottom line is that the arteries must let in more blood than the veins let out for adequate pressure to build. When this blood is temporarily trapped under pressure, the results are uplifting. To watch this result everyday, buy viagra - the most effective medication on the market.