Erection is achieved by filling the two CorporaCavernosa chambers with blood. Unlike some other mammals, humans have no erectile bone and have to rely instead on engorgement with blood to reach erection.
Whenthe erection is triggered by sexual stimulation, the art eries that bring blood to the penis dilate in order to increase blood flow. The sponge-like Corpora Cavernosa fills up with blood, which makes the penis stiff. Thestiffer tissues constrict the veins that carry blood away from the penis in order to maintain the erection.
Every malebaby is born with a full set of reproductive organs. However, these organs are not fully developed and remain so until the boy enters puberty.
At puberty, usually between the ages of 10 and 14, the pituitary gland starts secreting hormones that induce the testicles to produce testosterone. Thisis the hormone that controls all the physical and many of the psychological traits that define man.
Its presence ensures the development of bigger bones and higher muscle mass in men. It is also responsible for the increase in penis and testicles size, the apparition of pubic hair and the deeper tone of the malevoice.
Thepenis stops growing at the end of puberty, which comes around the age of 18. However, there are many environmental factors that may delay or accelerate the onset or the end of puberty. This means that some menmayexperience penis growth beyond the age of 18.
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