What is the role of the cervix during pregnancy?

Correct Answer: A

Rationale: The correct answer is A: Prevent infection and maintain pregnancy. The cervix acts as a physical barrier to prevent infections from reaching the uterus, protecting the developing fetus. It also produces mucus that blocks the entry of harmful microorganisms. Additionally, the cervix helps maintain the pregnancy by staying closed and firm until it's time for labor. Choice B (Facilitate sperm entry) is incorrect because the cervix actually filters and allows only healthy sperm to pass through. Choice C (Support implantation of the fertilized egg) is incorrect because the cervix is not directly involved in the implantation process, which occurs in the uterus. Choice D (Produce estrogen) is incorrect because estrogen is primarily produced by the ovaries, not the cervix.

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: A

Rationale: The correct answer is A: LH (Luteinizing Hormone). LH surge triggers ovulation by stimulating the release of eggs from the ovary. It works in conjunction with FSH to facilitate follicle development. Estrogen supports the growth of the uterine lining, while progesterone maintains it post-ovulation. FSH is responsible for follicle development but isn't the primary hormone for egg release.

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.