A Answers (3)
Jan Shifren, MD, Obstetrics & Gynecology, answeredTestosterone is a hormone produced by both men and women, although to a greater extent in men. In men, this hormone is responsible for promoting the development of male sex characteristics, libido, a deep voice, and facial hair. In women, testosterone influences libido, bone density, energy, and hair growth and is needed to produce estrogen.
Testosterone is one of the hormones needed for sexual development and is present in both males and females. Testosterone is considered an androgen, which is a male sex hormone, because it is made in much higher amounts in men than in women.
Testosterone helps strengthen bones and muscles in both men and women. In young men, testosterone signals the body to lower the voice, grow facial hair, and develop sexual characteristics. This hormone is also needed for sperm production.
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Harris McIlwain, Pain Medicine, answered
The main sex hormone in men is testosterone which is produced by the testes. Not only is testosterone important throughout a man's life cycle, it is a key player even before birth. The testes of a male fetus secrete testosterone which travels through the bloodstream. At this time, testosterone not only makes the genitals grow and function differently than the female anatomy, it also influences the development of the brain and other parts of the body, including the kidney, the liver, and muscle tissue.
During the first years of life, a boy's young body does not produce much testosterone. Then, at puberty, Leydig cells in the testes greatly increase the production of testosterone. At this time, the genitals grow, facial hair begins to grow, the boy’s voice deepens, and more changes occur that mark the transition from childhood to manhood.