Final answer:
The vas deferens is the organ involved in a vasectomy, which is a male surgical sterilization procedure preventing sperm from being part of the ejaculate.
Step-by-step explanation:
The organ involved in the procedure of vasectomy is the vas deferens. A vasectomy is a surgical sterilization procedure in males in which a small section of the vas deferens is removed or sealed. This interrupts the path taken by sperm from the testes through the vas deferens, meaning sperm cannot travel from the epididymis to be ejaculated out of the body.
Even after a vasectomy, semen (the fluid that carries sperm) is still produced, but it will not contain sperm, thereby preventing fertilization.