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Testosterone

Testosterone is the primary sex masculine hormone.
#biology
Zettelkasten, August 07, 2021
## Notes - Testosterone is the primary sex masculine [hormone](/zettel/hormone). - It plays several important roles, such as: - The development of the penis and testes; - The deepening of the voice during puberty; - The appearance of facial and pubic hair starting at puberty; - Muscle size and strength; - Bone growth and strength; - Sex drive (libido); - Sperm production. - Adolescent boys with too little testosterone may not experience normal masculinization. For example, genitals may not enlarge, and the voice may not deepen normally. - Signals sent from the brain to the pituitary gland control the production of testosterone in men. The pituitary gland then relays signals to the testes to produce testosterone. - A feedback loop closely regulates the amount of testosterone in the blood. When testosterone levels rise too high, the brain sends signals to the pituitary to reduce production. - Testosterone is also essential in females. These hormones are thought to have important effects on ovarian function, bone strength, and sexual behavior. ## References - [Harvard Health Publishing. Testosterone — What It Does And Doesn't Do](https://www.health.harvard.edu/drugs-and-medications/testosterone--what-it-does-and-doesnt-do)
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