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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.
Primary Reproductive Organs (gonads). The primary reproductive organs are the organs responsible for. 1  producing the egg and sperm cells (gametes), 2  producing hormones that function in the maturation of the reproductive system. 3  the development of sexual characteristics. 4  regulating the normal physiology of the reproductive system.