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Testes. Singular, testis. The paired male gonads, they are the primary organs of the male reproductive system and measure about two inches in length and one inch in diameter. They are located in the scrotum, or scrotal sac. Their role is to produce sperm and the hormone testosterone.he paired male gonads, they are the primary organs of the male reproductive system and measure about two inches in length and one inch in diameter.
RECOMMENDED LESSONS: The male reproductive system. The male reproductive system includes the testes (say test-eez), prostate glands, sperm ducts, urethra and penis (P). Sperm duct. During mating, sperm cells released pass through the sperm ducts. Testes. There are two testes (one of them is called a testis).he male reproductive system includes the testes (say test-eez), prostate glands, sperm ducts, urethra and penis (P). Sperm duct. During mating, sperm cells released pass through the sperm ducts.