ANATOMY

Detailed explanation-1: -Testosterone is the hormone that causes most of the changes in a guy’s body during puberty.

Detailed explanation-2: -How are testosterone levels controlled? Your body controls the levels of testosterone in your blood. Levels are usually highest in the morning and decline during the day. Your hypothalamus and pituitary gland control the amount of testosterone your gonads (testicles or ovaries) produce and release.

Detailed explanation-3: -For a male, the physical changes of puberty usually start with the testicles getting bigger. Dark, coarse, curly hair will sprout just above the penis and on the scrotum. The penis and testes will get larger, and erections happen more often. Ejaculation-the release of sperm-containing semen-also happens.

Detailed explanation-4: -The hypothalamus and pituitary gland control how much testosterone the testes produce and secrete. The hypothalamus sends a signal to the pituitary gland to release gonadotrophic substances (follicle stimulating hormone and luteinizing hormone). Luteinizing hormone (LH) stimulates testosterone production.

Detailed explanation-5: -Changes for Boys and Girls For boys, the hormones travel through the blood and tell the testes (say: TES-teez), the two egg-shaped glands in the scrotum (the sac that hangs under the penis), to begin making testosterone (say: tess-TAHS-tuh-rone) and sperm.