• Puberty lasts from about ages 12 to 18 years and is controlled by hormones.
  • The main pituitary hormone involved is luteinizing hormone (LH) It stimulates the testes to secrete testosterone.
  • Testosterone, in turn, promotes protein synthesis and growth.
  • Puberty is the period during which humans become sexually mature.
  • In the U.S., boys generally begin puberty at about age 12 and complete it at about 18.
  • In addition to the changes shown below, during puberty male facial hair begins to grow, the shoulders broaden, and the male voice deepens.
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