Which structure of the male reproductive system is shared between the urinary and reproductive systems?

• A. Urethra
• B. Vas deferens
• C. Prostate
• D. Penis

Answer: (A)

The shared structure is the urethra. In males, the urethra serves as the single conduit that carries both urine from the bladder and semen from the reproductive tract to the outside. It starts at the bladder neck, passes through the prostate (the prostatic portion), then through the pelvic floor and the penis to exit at the tip. Urine moves through it during urination, while semen travels through it during ejaculation. The body uses a sphincter mechanism to keep these pathways separate when needed, preventing semen from entering the bladder. The other options don’t serve as a common passage for both systems: the vas deferens is only part of the reproductive tract and transports sperm, not urine; the prostate is a gland that contributes fluid to semen; and the penis is an external organ that contains the urethra but is not itself the shared conduit.