Testosterone is an androgen sex hormone. A hormone is one that is made from cholesterol. A sex hormone is one that regulates sexual changes in the body. An androgen is the male type of sex hormone.

The testicles of men make lots of testosterone. Ovaries and adrenal glands make testosterone too. But they make much less than the testicles do. So men have much higher testosterone levels than women.

Testosterone has two different kinds of effects. One effect is anabolic. This effect causes growth of muscle and bone. The other effect of testosterone is androgenic. These effects make the body look male. This includes the effects that boys have at puberty: growing a beard, making the penis and testicles bigger, and making the voice deeper,contributes to sex drive, fat distribution, assist the development of mature sperm, strength and sperm,red blood cell production.However, an excess of testosterone can also cause women to experience male pattern baldness and infertility. an in cells in the testicles;Leydig cells produces androgen in women it’s ovaries and this androgen responsible for the male features either in the male or female.The brain and pituitary gland, a small gland at the base of the brain, control production of testosterone by the testes. From there, testosterone moves through our blood to do its work,An abnormality in the pituitary gland can impair the release of hormones from the pituitary gland to the testicles, affecting normal testosterone production. A pituitary tumor or other type of brain tumor located near the pituitary gland may cause testosterone or other hormone deficiencies
This short article about biology can be made longer.but testosterone is vice versa sex hormone...