During the follicular phase of the female menstrual cycle

Correct Answer: D

Rationale: During the follicular phase, the correct answer is D because it is when the ovaries produce estrogen to stimulate the thickening of the uterine lining. This prepares the uterus for potential implantation of a fertilized egg. In contrast, choice A is incorrect because the corpus luteum is not formed until after ovulation. Choice B is incorrect as the corpus luteum forms after the egg is released. Choice C is incorrect because progesterone is mainly secreted during the luteal phase to maintain the uterine lining.

Correct Answer: C

Rationale: The correct answer is C: Vulva. The vulva is the fleshy outer part of the female reproductive system that includes the labia majora, labia minora, clitoris, vaginal opening, and urethral opening. It is where the opening to the vagina is located. The uterus (A) is a hollow, muscular organ where the fetus develops during pregnancy. The ovary (B) is the female reproductive organ that produces eggs and hormones. Vaginitis (D) is inflammation or infection of the vagina, not the outer part of the reproductive system. Therefore, the correct answer is C as it accurately describes the external female genitalia where the vaginal opening is situated.

Correct Answer: B

Rationale: Step-by-step rationale: 1. FSH stimulates development of follicles in ovaries. 2. Follicle cells release estrogen. 3. Estrogen levels increase as follicles develop. 4. Estrogen plays key role in menstrual cycle regulation. Therefore, the correct answer is B (estrogen). Other choices are incorrect: A (hormones are broad, not specific), C (progesterone is released after ovulation), D (implantation occurs in the uterus, not ovaries).

Correct Answer: C

Rationale: Step 1: The epididymis is a structure where sperm mature and are stored. Step 2: The deferent duct (vas deferens) carries sperm from the epididymis to the urethra. Step 3: Since the deferent duct crosses the epididymis, choice C is correct. Summary: Choices A, B, and D are incorrect because they do not accurately describe the anatomical relationship between the epididymis and the deferent duct.

Correct Answer: C

Rationale: Step-by-step rationale: 1. The seminal vesicle secretes a fluid eliminated in the ejaculatory ducts. 2. This fluid provides nutrients and energy for the sperm. 3. It also helps to neutralize the acidic environment of the male urethra. 4. The fluid from the seminal vesicle combines with sperm to form semen for ejaculation. Summary: A: The seminal vesicle does not secrete androgenic hormones. B: Sperm cells are not secreted by the seminal vesicle. D: The seminal vesicle's fluid does not transport sperm cells; it provides support and nourishment for them.