Q: What is the name of the sac of skin that holds the testes in the male reproductive system?  

Answer: D

The scrotum is a thin, outer sac of skin that holds the testes in the male reproductive system. Each segment of the scrotum contains one testis and one epididymis, which is where the sperm are stored. The scrotum is located outside the male body and helps regulate the temperature of the testes for optimal sperm production. It contracts in cold temperatures to keep the testes warm and relaxes in warmer temperatures to cool the testes down. The scrotum is composed of layers of muscle and skin, and it is very sensitive to touch due to the high concentration of nerve endings.

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