This section describes the structures and functions of the male reproductive system in mammals, using humans as the prime example. You will also learn about the hormonal regulation of the male reproductive system. The discussion covers:
The primary sex organs, testes, that produce sperm and serve endocrine functions.
The accessory sex organs, including the ducts through which the sperm pass, the glands that produce and deliver secretions into those ducts, and the external genitalia.
Secondary sexual characteristics that result in male appearance but are not directly involved in reproduction.
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Semen contains sperm and a mixture of molecules that support the sperm and facilitate fertilization.
Sexual stimulation triggers responses in the nervous system and penile arterioles that result in erection.
Spermatogenesis and the maintenance of male secondary sexual characteristics depend on testosterone.