Final answer:
The male reproductive system secretes alkaline mucus to neutralize acidic urine in the urethra.
Step-by-step explanation:
The male reproductive system is responsible for the secretion of alkaline mucus to neutralize an acidic urine remaining in the urethra. The seminal vesicles, prostate gland, and bulbourethral gland are accessory glands associated with the male reproductive system that produce fluids to support sperm. The bulbourethral gland releases a secretion prior to the bulk of the semen, which neutralizes any acid residue in the urethra left over from urine.