What is the main purpose of the placenta during pregnancy?

Correct Answer: B

Rationale: Correct Answer: B - Provide oxygen and nutrients to the fetus Rationale: 1. The placenta is the organ that connects the developing fetus to the uterine wall, allowing for the exchange of nutrients, oxygen, and waste products. 2. It contains blood vessels that transport oxygen and nutrients from the mother to the fetus. 3. The placenta also filters out harmful substances and waste products from the fetus. 4. Providing oxygen and nutrients is crucial for the growth and development of the fetus during pregnancy. Summary: A: Incorrect - The placenta does help in removing waste products but its primary function is not excretion. C: Incorrect - While the placenta does support implantation by attaching the embryo to the uterine wall, its main purpose is not implantation. D: Incorrect - While the placenta does produce hormones like estrogen, its primary function is to provide essential nutrients and oxygen to the fetus.

Correct Answer: A

Rationale: Progesterone is the correct answer as it helps prepare the uterus for pregnancy by thickening the uterine lining to support implantation of a fertilized egg. Estrogen stimulates the growth of the uterine lining. FSH and LH are involved in the regulation of the menstrual cycle and ovulation, not specifically in preparing the uterus for pregnancy.

Correct Answer: C

Rationale: The correct answer is C: Transport eggs from the ovary to the uterus. The fallopian tubes serve as a passageway for eggs released from the ovary to travel to the uterus for potential fertilization. This is a crucial function in the reproductive process. The other choices are incorrect because: A: The fallopian tubes do not transport sperm; they transport eggs. B: The production of eggs occurs in the ovaries, not in the fallopian tubes. D: Estrogen is primarily produced by the ovaries and other endocrine glands, not by the fallopian tubes.

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: C

Rationale: The correct answer is C: Seminal vesicles. Seminal vesicles produce seminal fluid, which is a major component of semen. This fluid provides nutrients and protection for sperm, aiding in their motility and survival. The other choices are incorrect because: A: Epididymis - Stores and transports sperm, but does not produce seminal fluid. B: Prostate gland - Produces a milky fluid that helps nourish and protect sperm, but it is not the primary site for seminal fluid production. D: Testes - Produce sperm through spermatogenesis, but do not directly produce seminal fluid.