Which part of the male reproductive system produces the fluid that nourishes sperm?

Correct Answer: C

Rationale: The correct answer is C: Seminal vesicles. Seminal vesicles produce the fluid that nourishes and protects sperm. They contribute a significant portion of the volume of semen. The other choices are incorrect because: A: Epididymis stores and transports sperm, but does not produce nourishing fluid. B: Prostate gland secretes a thin, milky fluid that helps sperm mobility, but not the main nourishing fluid. D: Vas deferens transports sperm from the testes to the urethra, but does not produce nourishing fluid.

Correct Answer: A

Rationale: The correct answer is A: Prolactin. Prolactin is the hormone responsible for the secretion of milk in females. It is produced by the anterior pituitary gland and stimulates the mammary glands to produce milk. Oxytocin is also involved in milk ejection but not milk production. Estrogen and progesterone are reproductive hormones and do not directly stimulate milk production.

Correct Answer: C

Rationale: The correct answer is C: Maintain the uterine lining for implantation. Progesterone plays a crucial role in preparing and maintaining the uterine lining to support the implantation and growth of the fertilized egg. This hormone helps create a suitable environment for the developing embryo by thickening the uterine lining and preventing its shedding. Explanation for other choices: A: Stimulate uterine contractions - This is incorrect as progesterone actually inhibits uterine contractions during pregnancy to prevent premature labor. B: Support the development of the fetus - While progesterone indirectly supports fetal development by maintaining the uterine environment, its primary function is not directly related to fetal development. D: Promote breast development - Progesterone does play a role in breast development during pregnancy, but its primary function is not focused on this aspect.

Correct Answer: B

Rationale: The correct answer is B: FSH (Follicle-Stimulating Hormone). FSH stimulates the Sertoli cells in the testes to promote sperm production. Testosterone (A) is responsible for male characteristics, not sperm production. LH (C) stimulates testosterone production in the testes but does not directly stimulate sperm production. Prolactin (D) is not involved in sperm production in males. Therefore, FSH is the correct choice as it directly stimulates the production of sperm in males by acting on the Sertoli cells.

Correct Answer: B

Rationale: The correct answer is B: It forms a mucous plug to protect the uterus. During pregnancy, the cervix produces a thick mucus plug that seals the opening of the uterus, providing a barrier against infections and protecting the developing fetus. This plug helps prevent bacteria from entering the uterus and causing harm. Choice A is incorrect because the cervix actually closes during pregnancy to protect the developing fetus from infections. Choice C is incorrect because while the cervix may respond to hormonal changes during pregnancy, it does not secrete estrogen to prepare the uterus. Choice D is incorrect because the production of progesterone during pregnancy primarily occurs in the ovaries and the placenta, not the cervix.