Which structure of the male reproductive system is suspended in a sac?

• A. Penis
• B. Prostate
• C. Testes
• D. Urethra

Answer: (C)

Keeping sperm at the right temperature requires the testes to hang in the scrotal sac outside the body. The scrotum is a skin-covered pouch that suspends the testes below the pelvic cavity, and it contains the nerves, blood vessels, and the vas deferens in the spermatic cords. This external position, along with temperature-regulating muscles like the cremaster and dartos, helps keep the testes cooler than core body temperature, which is important for spermatogenesis.

The other structures don’t sit in a scrotal sac. The penis is an external organ, not suspended in a protective sack. The prostate is located inside the pelvic cavity below the bladder, not in the scrotum. The urethra is a tube that carries urine and semen and runs through the length of the penis; it isn’t suspended in a scrotal sac.