In the year 1992 the molecule Nitric Oxide was called the molecule of the year by the scientific community. The reason for this is that it plays an extremely vital role in regulating blood pressure as well as the functionality of the immune system. Furthermore it plays a fundamental role in male (and female) erections. If you are wondering what I mean by female erections, the explanation is that the female clitoris is developmentally equivalent to the male penis (both are derived from the same developmental structure in early neonatal development). And just like the penis gets bigger and erected during arousal so does the clitoris. The mechanism responsible for both of these phenomena are the same. Namely nitric oxide acting on smooth muscle in a relaxatory fashion.
The penis, the clitoris as well as the wall of arteries are primarily composed of smooth muscle. Smooth muscle is not under voluntary control like skeletal muscle (i.e. the muscles like the biceps or the quadriceps). When nitric oxide binds to such muscle it causes relaxation. Such relaxation dilates blood vessels. In the heart arteries and in arteries all over the body this means a drop in blood pressure and more blood flow. This is something desirable as more blood means more oxygen and nutrients to the tissues that the arteries supply. In the penis and the clitoris the increased blood flow means that more blood crosses from the arteries into the erectile tissues of these organs. The reason for this is that the blood vessels in these organs are perforated allowing blood to escape from the inside of the blood vessel to the outside into the erectile tissue. This is what cases these organs to get engorged with blood making them hard, erect and more sensitive to touch….Read more….