What is the primary purpose of the placenta during pregnancy?

Correct Answer: B

Rationale: The primary purpose of the placenta during pregnancy is to provide oxygen and nutrients to the fetus. The placenta acts as a bridge between the mother and the fetus, allowing for the exchange of oxygen, nutrients, and waste products. It filters oxygen and nutrients from the mother's blood to the fetus and removes waste products from the fetal blood to the mother's circulation. This process ensures the proper growth and development of the fetus. Choice A is incorrect because the placenta does not excrete waste products, it filters them. Choice C is incorrect as the placenta does not regulate the fetus's temperature. Choice D is incorrect because hCG (human chorionic gonadotropin) is a hormone produced by the embryo, not the placenta.

Correct Answer: B

Rationale: The correct answer is B: Secretes fluids that make up semen. The prostate gland secretes a milky fluid that makes up a significant portion of semen, aiding in sperm mobility and viability. This fluid also helps neutralize the acidic environment of the vagina, enhancing sperm survival. Option A is incorrect as the testes store sperm, not the prostate gland. Option C is incorrect as testosterone is primarily produced in the testes. Option D is incorrect as sperm production is regulated by the hypothalamus and pituitary gland, not the prostate gland.

Correct Answer: C

Rationale: The myometrium is the muscular layer of the uterus responsible for contracting during labor to facilitate childbirth. It helps push the baby out. Choice A is incorrect as the myometrium does not support the endometrial lining. Choice B is incorrect as the myometrium does not facilitate implantation. Choice D is incorrect as the myometrium does not secrete estrogen.

Correct Answer: A

Rationale: The correct answer is A: Ovary. Estrogen is primarily produced by the ovaries, specifically by the ovarian follicles. The ovaries contain specialized cells that produce estrogen in response to hormonal signals. Estrogen plays a crucial role in regulating the menstrual cycle, promoting the development of secondary sexual characteristics, and maintaining reproductive health. The other choices (B: Uterus, C: Fallopian tubes, D: Cervix) are incorrect because they do not play a direct role in the production of estrogen. The uterus is the organ where a fertilized egg implants and develops during pregnancy. The fallopian tubes are responsible for transporting eggs from the ovaries to the uterus. The cervix is the lower part of the uterus that connects to the vagina. While these structures are important for reproduction, they do not produce estrogen.

Correct Answer: B

Rationale: Testosterone is the correct answer because it is the primary male sex hormone responsible for the development of male secondary sexual characteristics such as facial hair, deep voice, and muscle growth. Estrogen (A) is the primary female sex hormone, progesterone (C) is involved in menstrual cycle regulation, and FSH (D) is a hormone that stimulates egg production in females.