What is the role of the corpus luteum in the menstrual cycle?

Correct Answer: B

Rationale: Step 1: The corpus luteum is formed from the ruptured follicle after ovulation. Step 2: It secretes progesterone to maintain the endometrium for potential implantation. Step 3: If fertilization doesn't occur, corpus luteum degenerates, leading to menstruation. Step 4: Thus, the correct answer is B, as it plays a crucial role in endometrial maintenance. Summary: A secretes estrogen, C stimulates ovulation, and D stimulates sperm production, which are not the primary functions of the corpus luteum in the menstrual cycle.

Correct Answer: C

Rationale: The correct function of the vas deferens is to transport sperm from the epididymis to the urethra for ejaculation. This is a crucial step in the male reproductive system for delivering sperm during ejaculation. The other choices are incorrect because: A: The storage of sperm occurs in the epididymis, not the vas deferens. B: Secretion of seminal fluid is the role of the seminal vesicles and prostate gland, not the vas deferens. D: Testosterone production is primarily carried out by the testes, not the vas deferens.

Correct Answer: C

Rationale: Rationale: 1. The menstrual phase is the phase where the uterine lining sheds. 2. This occurs when there is no pregnancy and the hormone levels drop. 3. Shedding of the lining leads to menstrual bleeding. 4. The follicular phase is characterized by follicle development. 5. The luteal phase follows ovulation and prepares the uterus for a potential pregnancy. 6. Ovulation refers to the release of the egg from the ovary, not shedding of the uterine lining. Summary: - A: Follicular phase - Incorrect, focuses on follicle development. - B: Luteal phase - Incorrect, prepares the uterus for potential pregnancy. - C: Menstrual phase - Correct, characterized by shedding of uterine lining. - D: Ovulation phase - Incorrect, refers to the release of the egg.

Correct Answer: A

Rationale: The correct answer is A: Synthesize testosterone. Interstitial cells in the testes, also known as Leydig cells, are responsible for producing testosterone, the primary male sex hormone. Testosterone plays a crucial role in the development of male reproductive organs, secondary sexual characteristics, and overall reproductive function. The other choices are incorrect because storing sperm (B) is the role of the epididymis, producing seminal fluid (C) is the role of the seminal vesicles, and maturing sperm (D) occurs in the seminiferous tubules through the process of spermatogenesis.

Correct Answer: C

Rationale: The correct answer is C: Epididymis. The epididymis is a coiled tube located on top of the testes where sperm are stored after production. It allows for maturation and storage of sperm before they are ejaculated. The other choices, A: Seminal vesicle, B: Vas deferens, and D: Prostate gland, do not store sperm. The seminal vesicle produces seminal fluid, the vas deferens transports sperm from the testes to the urethra, and the prostate gland secretes fluid that nourishes and protects sperm. Therefore, the epididymis is the correct choice as it specifically stores sperm after production.