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In page Secondary sex characteristic:

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The increased secretion of testosterone from the testes during puberty causes the male secondary sexual characteristics to be manifested.[1] Testosterone directly increases size and mass of muscles, vocal cords, and bones, deepening of the voice, and changing the shape of the face and skeleton.[2] Converted into DHT in the skin, it accelerates growth of androgen-responsive facial and body hair but may slow and eventually stop the growth of head hair.[citation needed] Taller stature is largely a result of later puberty and slower epiphyseal fusion.[citation needed] Overall, male secondary sex characteristics include: