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The body of the penis contains three cylindrical masses of tissue.
The lower Mass is the corpus spongiosum and the top two masses are called corpora cavernosa.
An elastic fiber sheath called the Tunica albuginea surrounds all three masses.
A cross-section cut of each cylinder looks like a sponge
because of the hollow lacunar spaces that fill with blood during an erection
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Sexual stimulation, the brain sends various types of stimuli that are sent down the spinal cord
A division of the nervous system called the parasympathetic nervous system activates
The parasympathetic nervous system sends signals to the penis and causes nitric oxide
to be released foreign then this nitric oxide activates an enzyme called guanylate cyclase
This enzyme causes increased levels of another molecule called cyclic
guanosine monophosphate or cyclic GMP
Cyclic GMP is responsible for the vassal dilation of the arteries within the corpora cavernosa
resulting in smooth muscle relaxation for foreign blood to flow in and fill the Open Spaces
As the blood continues to flow into the penis, pressure increases and results in a rigid erection
An erection is essentially a vascular event that results from increased blood flow into the penis
as part of the normal erection process, an enzyme in erectile tissue called phosphodiesterase 5 or
pde5 breaks down cyclic GMP and makes smooth muscle contraction
As erectile tissue contracts, blood drains more easily from the penis
and leaving it in a flaccid State and ending the erection
Erectile dysfunction, or Ed, means you have trouble getting and keeping the
erection that forms enough to allow you to have sex
Becomes more common as you get older, but it's not a natural part of aging Ed can be
a sign of health problems men with underlying cardiovascular diseases such as hypertension,
heart disease, osteosclerosis, diabetes, and kidney disease often report erectile dysfunction
Getting more exercise, losing weight, and stopping smoking can help
For many men the solution is as simple as taking a pill such as Viagra Viagra is a
selective pde5 enzyme inhibitor Viagra stops the pde5 enzyme from breaking down cyclic GMP
so the levels of cyclic GMP will be increased and muscle relaxation enhanced,
thus giving the ability to achieve and maintain an erection Viagra has no direct effect on the
tissues and arteries in the penis and has no effect in the absence of sexual stimulation
Viagra should be taken at least one hour before planning intercourse
to allow the absorption of the medication on an empty stomach
The result lasts about four hours
Before taking a pill, discuss it with your healthcare provider
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