What is the primary function of the vagina in the female reproductive system?

Correct Answer: B

Rationale: The correct answer is B. The primary function of the vagina is to facilitate sperm entry into the uterus during sexual intercourse for fertilization to occur. The vagina serves as the passageway for sperm to travel from the penis into the uterus where fertilization takes place. The other choices are incorrect for the following reasons: A: Support implantation - Implantation occurs in the uterus, not the vagina. C: Store eggs - Eggs are stored in the ovaries, not the vagina. D: Secrete estrogen - Estrogen is primarily produced by the ovaries, not the vagina.

Correct Answer: B

Rationale: The correct answer is B: Progesterone. Progesterone is responsible for thickening the endometrial lining in preparation for pregnancy by promoting the growth of blood vessels and glands. It also helps maintain the uterine lining to support a fertilized egg. Estrogen (choice A) stimulates the growth of the endometrium but progesterone is crucial for thickening. FSH (choice C) and LH (choice D) are involved in the regulation of the menstrual cycle and ovulation, not specifically in thickening the endometrial lining.

Correct Answer: A

Rationale: Estrogen is the correct answer as it is the primary hormone responsible for the development of the female reproductive system during puberty. It stimulates the growth of the ovaries, regulates the menstrual cycle, and promotes the development of secondary sexual characteristics. Progesterone is involved in maintaining pregnancy, not puberty. FSH (Follicle Stimulating Hormone) is involved in the maturation of ovarian follicles, not overall reproductive system development. Testosterone is a male sex hormone and is not primarily responsible for the development of the female reproductive system.

Correct Answer: D

Rationale: The correct answer is D (All of the above) because all three hormones (FSH, LH, and Estrogen) play crucial roles in regulating the menstrual cycle. FSH stimulates the growth of ovarian follicles, LH triggers ovulation and promotes the formation of the corpus luteum, and Estrogen helps in the development and maintenance of the uterine lining. Together, these hormones work in a coordinated manner to ensure the proper functioning of the menstrual cycle. Therefore, selecting all of the above is the correct choice as each hormone is indispensable in the regulation of the menstrual cycle.

Correct Answer: A

Rationale: The primary function of the ovaries in females is to produce eggs, which are essential for reproduction. Ovaries contain structures called follicles that release mature eggs during ovulation. This process is crucial for fertilization to occur. The other choices are incorrect because storing sperm is the function of the male reproductive system, producing estrogen and progesterone is a function of the ovaries but not the primary one, and facilitating fertilization is a process that involves multiple reproductive structures, not just the ovaries. Hence, choice A is the correct answer.