Final answer:
Sperm are transported from the testis to the urethra by the vas deferens, a muscular tube that carries sperm from the epididymis and eventually to the urethra for ejaculation.
Step-by-step explanation:
Sperm are transported from the testis towards the urethra by the vas deferens. After leaving the seminiferous tubules in the testes, sperm enter the epididymis where they mature and become motile. The mature sperm are then stored in the tail of the epididymis until ejaculation. During ejaculation, sperm exit the tail of the epididymis and are propelled by smooth muscle contractions into the vas deferens. The vas deferens is a thick, muscular tube that plays a crucial role in the sperm transport process, carrying sperm from the epididymis, behind the bladder, and toward the urethra.