What part of the male reproductive system stores sperm after they are produced?

Correct Answer: D

Rationale: The correct answer is D: Epididymis. The epididymis is a coiled tube located on the back of each testicle, where sperm are stored and matured after they are produced in the testes. It allows for sperm to gain motility and fertilizing capabilities. The other choices are incorrect because: A: The prostate gland secretes fluid that nourishes and protects sperm but does not store them. B: The vas deferens is a duct that carries sperm from the epididymis to the urethra but does not store them. C: Seminal vesicles produce seminal fluid that nourishes sperm but do not store them.

Correct Answer: B

Rationale: The correct answer is B: Progesterone. Progesterone helps maintain pregnancy by inhibiting ovulation. It prepares the uterus for implantation and supports the growth of the embryo. Estrogen (A) is important for the menstrual cycle but does not specifically prevent ovulation. Testosterone (C) plays a role in male characteristics and fertility but is not directly involved in maintaining pregnancy. Human Chorionic Gonadotropin (hCG) (D) is produced during pregnancy but does not prevent ovulation; it helps in sustaining the pregnancy by supporting the corpus luteum to produce progesterone.

Correct Answer: D

Rationale: The correct answer is D: LH (Luteinizing Hormone). LH surge triggers the release of the egg during ovulation. It stimulates the follicle to rupture and release the mature egg. FSH stimulates follicle development, estrogen prepares the body for ovulation, and progesterone maintains the uterine lining post-ovulation. LH is the hormone directly responsible for the release of the egg, making it the correct choice.

Correct Answer: C

Rationale: The correct answer is C: Epididymis. The epididymis is responsible for storing and maturing sperm. Sperm are produced in the testes and then travel to the epididymis for storage and maturation. The other choices, A: Seminal vesicles, B: Prostate gland, and D: Vas deferens, are not directly involved in storing and maturing sperm. Seminal vesicles and prostate gland produce fluids that nourish and protect sperm, while vas deferens is responsible for transporting sperm from the epididymis to the urethra during ejaculation.

Correct Answer: B

Rationale: The correct answer is B: Maintain the endometrium. Progesterone plays a crucial role in pregnancy by maintaining the endometrium, which is essential for the implantation and nourishment of the fertilized egg. Progesterone helps to thicken the endometrial lining, ensuring a suitable environment for implantation and supporting the developing fetus. Promoting ovulation (A) is primarily controlled by estrogen. Stimulating labor (C) is mainly regulated by oxytocin. Supporting lactation (D) is primarily influenced by the hormone prolactin. Therefore, the primary role of progesterone in pregnancy is to maintain the endometrium for the successful development of the pregnancy.