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Enteroendocrine cells of the intestine are the most numerous endocrine cells of the body. They constitute an enteric endocrine system as a subset of the endocrine system just as the enteric nervous system is a subset of the nervous system.
The __________ are organs that produce the male hormone testosterone and reproductive cells called sperm. sperm. The testes produce reproductive cells called __________. semen. Internal organs combine sperm with a fluid energy source producing __________. ovaries. Internal organs called __________ produce egg cells. ovulation. Once a month the __________ process releases an egg. uterus. A hollow, pear-shaped, muscular organ in which fertilized eggs develop is called the __________. vagina. The __________, or birth canal, is a muscular tube that opens to the outside of the body.