SLP Hormones

Puberty in Boys

  Puberty starts at about 12 or 13 years of age in boys. Hormonal changes stimulate an increase in growth rate, alterations in behaviour, anlargement of the genitals, and the appearance of secondary sexual characteristics such as facial hair.

  Because boys begin their final growth spurt later than girls, they have a longer period of steady growth and usually attain a greater adult height.

Hormones in boys

  At puberty, gonadotrophin-releasing hormone (GnRH) from the hypothalamus triggers the pituitary gland to release follicle-stimulating hormone (FSH) and luteinizing hormone (LH). This prompts hormone-producing (interstitial) cells of the testes to increase their secretion of testosterone, the male sex hormone; the sperm-producing (Sertoli) cells are also activated.

Physical changes in boys

  From about the age of 12, boys begin a period of rapid growth, and their body weight can double during adolescence. The genitals enlarge, facial and body hair increases, and the voice deepens.

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