What hormone is primarily responsible for the regulation of the menstrual cycle?

Correct Answer: A

Rationale: Estrogen is the correct answer as it plays a crucial role in regulating the menstrual cycle. It promotes the growth of the uterine lining and stimulates ovulation. Progesterone works in conjunction with estrogen but is primarily involved in preparing the uterus for potential pregnancy. FSH and LH are both involved in the regulation of the menstrual cycle, but they primarily stimulate the development of follicles and ovulation, respectively. Estrogen, however, is the hormone that has a direct and central role in orchestrating the entire menstrual cycle by controlling various processes like follicle development, ovulation, and the thickening of the uterine lining.

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: Estrogen is the correct answer as it stimulates the growth of the uterine lining during the menstrual cycle. Estrogen is produced by the ovaries and peaks around ovulation, promoting the thickening of the endometrium to prepare for potential implantation. Progesterone, on the other hand, helps maintain the uterine lining after it has been thickened by estrogen. FSH and LH are involved in follicle development and ovulation, respectively, but they do not directly stimulate uterine lining growth.

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.