Which hormone stimulates the release of milk from the mammary glands?

Correct Answer: B

Rationale: The correct answer is B: Oxytocin. Oxytocin is the hormone responsible for stimulating the release of milk from the mammary glands. It acts by causing the contraction of the myoepithelial cells surrounding the alveoli in the breast, leading to the ejection of milk into the ducts. Estrogen (A) and FSH (D) are not directly involved in milk release. Prolactin (C) plays a role in milk production but not in the actual release of milk.

Correct Answer: B

Rationale: The purpose of the zona pellucida during fertilization is to protect the egg during early development. It acts as a protective barrier around the egg, preventing polyspermy and providing structural support for the developing embryo. This choice is correct because the zona pellucida serves as a crucial protective layer for the egg in the initial stages post-fertilization. - A: Incorrect because the zona pellucida actually allows sperm entry into the egg. - C: Incorrect because the zona pellucida does not specifically facilitate sperm entry; its primary function is protection. - D: Incorrect because the zona pellucida is not directly involved in egg implantation, but rather in early embryonic development.

Correct Answer: B

Rationale: The correct answer is B: Capture the egg after ovulation. Rationale: 1. Fimbriae are finger-like projections at the end of the fallopian tube. 2. After ovulation, the fimbriae help in capturing the released egg from the ovary. 3. The captured egg is then transported to the fallopian tube for potential fertilization. Summary: A: Incorrect - Fimbriae do not transport the egg from the ovary to the uterus. C: Incorrect - Fimbriae do not support fertilization directly. D: Incorrect - Fimbriae do not release hormones.

Correct Answer: D

Rationale: The correct answer is D: LH (luteinizing hormone). LH is responsible for stimulating the release of eggs from the ovaries during ovulation. This hormone triggers the final maturation and release of the egg from the ovarian follicle. Estrogen and progesterone play roles in the menstrual cycle but do not directly stimulate egg release. FSH (follicle-stimulating hormone) is involved in follicle development but does not trigger egg release. Therefore, LH is the correct choice for its specific role in ovulation.

Correct Answer: B

Rationale: The correct answer is B: Secrete seminal fluid. Seminal vesicles produce and secrete seminal fluid, which is a major component of semen. This fluid provides nutrients and protection for sperm, aiding in their motility and survival. Storing sperm (choice A) is primarily the function of the epididymis. Testosterone production (choice C) occurs in the testes, while sperm production (choice D) takes place in the testes as well. Therefore, choice B is the correct answer as seminal vesicles specifically contribute to the production of seminal fluid.