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In the male, the principal sex hormones are the androgens, of which testosterone is the most important. The androgens are steroid hormones produced mainly by the Leydig cells(interstitial cells located near the seminiferous tubules) of the Testes.
These seminiferous tubules are considered the functional elements of the testes. It is within these tubules that sperm is created. This process is known as spermatogenesis. Sperm is created at a phenomenal speed, the testes can create over a million per day, which rounds out to thousands of sperm per second.