Final answer:
The vas deferens is the organ that transports sperm to the urethra, serving as a bridge between the epididymis and the ejaculatory ducts leading into the urethra.
Step-by-step explanation:
The organ that transports sperm to the urethra is the vas deferens. This tubular structure connects from the epididymis, where sperm mature and are stored, to the ejaculatory ducts leading into the urethra. The journey of sperm begins in the testes, where they are produced in the seminiferous tubules. After production, they move to the epididymis where they undergo maturation. Upon ejaculation, sperm are propelled from the epididymis through the vas deferens, which is designed to transport them effectively. This duct eventually merges with the ducts from the seminal vesicles to form the ejaculatory duct, which then opens into the urethra.
The seminal vesicles and the prostate gland do not transport sperm, but they are important as they contribute fluids to the semen, providing sperm with the necessary nutrients and creating a suitable pH environment for sperm survival outside the body.