Which of the following is not a part of the life cycle of sperm?

• A. Produced in specialized cells and ducts in the male testicle
• B. Develops and matures in the epididymis
• C. Carried through the vasa deferentia to the urethra during ejaculation
• D. Deposited by the seminal vesicles

Answer: (D)

The life cycle of sperm involves several stages, starting from their production in the male reproductive system to their eventual release.

Sperm are produced in specialized cells within the testes, specifically in the seminiferous tubules. After production, they undergo development and maturation in the epididymis, which is a coiled tube attached to the back of each testis. Once matured, sperm travel through the vas deferens during ejaculation, which is the pathway that leads from the epididymis to the urethra.

The option stating that sperm are deposited by the seminal vesicles is not accurate. The seminal vesicles do not deposit sperm; instead, they contribute fluids to make up a significant portion of semen, which nourishes and helps transport the sperm during ejaculation. The seminal vesicles release these fluids into the ejaculatory duct, where they mix with sperm from the vas deferens before being expelled through the urethra.

Thus, the focus of the life cycle of sperm does not include the action of the seminal vesicles as part of sperm's own life cycle, making this the correct answer.