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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.
The main organs in the reproductive system are the gonads, which include the ovary and testis. The ovaries produce eggs and the testes produce sperm. The egg and the sperm are gametes that combine to form a zygote in a process called fertilization. The zygote will grow and develop into a new individual of the species.