Pedro Arantes


Testosterone is the primary sex masculine hormone.
Zettelkasten, August 7th, 2021.


  • Testosterone is the primary sex masculine 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.


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