Which hormone is primarily responsible for regulating the menstrual cycle in females?

Correct Answer: B

Rationale: The correct answer is B: Estrogen. Estrogen is primarily responsible for regulating the menstrual cycle in females by stimulating the growth of the uterine lining. It also plays a key role in ovulation. FSH stimulates the growth of ovarian follicles, LH triggers ovulation, and Progesterone helps maintain the uterine lining after ovulation. However, Estrogen is the main hormone that drives the menstrual cycle's key phases.

Correct Answer: A

Rationale: The correct answer is A because the prostate gland produces seminal fluid, which is a key component of semen. This fluid helps nourish and protect sperm. The other choices are incorrect because the prostate gland does not store sperm (B), produce eggs (C), or secrete testosterone (D). Sperm is primarily stored in the epididymis, eggs are produced in the ovaries, and testosterone is mainly secreted by the testes. Therefore, the prostate gland's main function is to produce seminal fluid, making choice A the correct answer.

Correct Answer: C

Rationale: The corpus luteum is formed from the ruptured follicle after ovulation. It secretes progesterone to prepare and maintain the uterine lining for potential implantation of a fertilized egg. This is crucial for a successful pregnancy. Options A, B, and D are incorrect because the corpus luteum's main function is to secrete progesterone, not to stimulate ovulation, produce estrogen, or mature eggs.

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 mature and are stored before ejaculation. It allows for sperm to gain motility and fertilizing ability. The other choices (A, B, C) are incorrect because the vas deferens is the tube that carries sperm from the epididymis to the urethra, seminal vesicles produce seminal fluid that nourishes and transports sperm, and the prostate gland secretes fluids that protect and nourish sperm, but none of these structures store sperm before ejaculation.

Correct Answer: B

Rationale: The correct answer is B: LH (Luteinizing Hormone). LH regulates the development and function of the testes in males by stimulating Leydig cells to produce testosterone. FSH (Choice A) stimulates sperm production but does not directly regulate testes development. Testosterone (Choice C) is produced by the testes and is not a regulating hormone. Prolactin (Choice D) is not involved in testes development.