Which hormone helps maintain pregnancy by preventing ovulation?

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: 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.

Correct Answer: B

Rationale: The correct answer is B: Uterus. After fertilization, the fertilized egg travels from the fallopian tube to the uterus for implantation. The uterus provides a suitable environment for the development of the embryo. The other choices are incorrect because: A: Ovary - Ovaries produce eggs but do not have a direct role in the implantation of the fertilized egg. C: Fallopian tube - While fertilization occurs in the fallopian tube, implantation takes place in the uterus. D: Cervix - The cervix is the lower part of the uterus that connects to the vagina and plays a role in facilitating sperm entry into the uterus, not in implantation.

Correct Answer: A

Rationale: The correct answer is A: Seminal vesicles. Seminal vesicles are responsible for secreting fluid that nourishes sperm. This fluid provides nutrients and energy for the sperm to survive and swim. The other choices are incorrect because: B: Prostate gland secretes a fluid that helps with sperm motility and viability, but it does not specifically nourish sperm. C: Epididymis is a coiled tube where sperm mature and are stored, but it does not secrete nourishing fluid. D: Testes produce sperm and testosterone but do not secrete nourishing fluid for sperm.