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Prenatal development of male reproductive structures. Once testes are developed by a fetus, they start to secrete testosterone. Testosterone is a steroid hormone. Testosterone causes some regions of the embryo to develop into male reproductive structures. Development of secondary sexual characteristics. Secretion of testosterone by the testes increases at puberty.This causes: Sperm production. Growth of the penis and testes. Pubic, body, and facial hair growth. Increased muscle mass.
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