Which of the following hormones is produced by the pituitary gland?

Correct Answer: B

Rationale: The correct answer is B: FSH. The pituitary gland produces follicle-stimulating hormone (FSH), which plays a key role in reproductive functions. FSH stimulates the growth and maturation of ovarian follicles in females and sperm production in males. A: Progesterone is produced by the ovaries and placenta in females. C: Estrogen is produced by the ovaries and adrenal glands in females. D: Testosterone is produced by the testes in males and in smaller amounts by the ovaries and adrenal glands in females.

Correct Answer: B

Rationale: The correct answer is B: Oxytocin. Oxytocin is responsible for stimulating uterine contractions during labor. It is produced by the hypothalamus and released by the pituitary gland. Oxytocin acts on the smooth muscles of the uterus to initiate and regulate contractions, aiding in the progression of labor. Progesterone (A) helps maintain the uterine lining during pregnancy, while Prolactin (C) stimulates milk production. FSH (D) is a hormone that stimulates the growth and maturation of ovarian follicles in the ovaries.

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.