Question

Testosterone causes the male secondary sex characteristics to appear at puberty. Name three examples of male secondary sex characteristics.

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Secondary Sex Characteristics in Male

Testosterone stimulates the development and maintenance of male sex characteristics : a- production of sperms. b- Hair : - body hair is increased but scalp hair is decreased - hair appears on the face, on the chest, in the axilla and over the pubis. - hairline is indented ( recedes back ) in the lateral frontal region. - Hereditary baldness appears. - Pubic hair is triangular with apex up towards the umbilicus ( male pattern ). c- Skin : is thickened with excessive thick secretion of sebaceous glands ------- Acne. d- Voice : larynx enlarges, vocal cords increase in length and thickness. voice becomes deeper and lower in pitch. e- Body configuration : shoulders broaden and muscles enlarge. f- Behavior changes : increased libido ( sexual desire ) and males become aggressive.

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