key concept 42.3 Male Sex Organs Produce and May Deliver Sperm

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:

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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.