What is the role of the placenta during pregnancy?

Correct Answer: B

Rationale: The correct answer is B: Provide oxygen and nutrients to the fetus. The placenta acts as a bridge between the mother and fetus, allowing the exchange of oxygen and nutrients necessary for fetal growth and development. It also helps in removing waste products from the fetus. Choices A and D are incorrect as the placenta does not excrete waste products or help in the production of milk. Choice C is incorrect as the placenta does not store the fetus but rather provides essential support and nourishment during pregnancy.

Correct Answer: B

Rationale: The correct answer is B: Seminal vesicles. Seminal vesicles produce seminal fluid, which is a major component of semen. They contribute fructose, prostaglandins, and other substances to nourish and protect sperm. The prostate gland (choice A) produces a milky fluid that helps activate sperm. The epididymis (choice C) is a coiled tube where sperm mature and are stored. The testes (choice D) produce sperm and testosterone, but not seminal fluid. Therefore, the correct choice is B as seminal vesicles specifically produce seminal fluid.

Correct Answer: C

Rationale: The correct answer is C: Estrogen. Estrogen is responsible for the development of secondary sexual characteristics in females such as breast development, widening of hips, and the growth of pubic and underarm hair. Testosterone (A) is a male sex hormone, progesterone (B) is involved in the menstrual cycle and pregnancy, and FSH (D) is a hormone that stimulates the ovaries to produce eggs. Estrogen plays a key role in the development and maintenance of female secondary sexual characteristics, making it the correct choice in this context.

Correct Answer: C

Rationale: The correct answer is C: FSH. Follicle-stimulating hormone (FSH) stimulates the production of sperm in males by acting on the testes. FSH plays a crucial role in spermatogenesis by promoting the growth and maturation of sperm cells. Estrogen (A) and progesterone (D) are female sex hormones and do not directly stimulate sperm production. Testosterone (B) is important for sperm production but is not the hormone that directly stimulates it; rather, it plays a role in maintaining overall reproductive function in males.

Correct Answer: A

Rationale: The epididymis functions to store sperm and allow them to mature. Sperm produced in the testes are transported to the epididymis where they undergo maturation and become motile. This process is essential for sperm to acquire the ability to fertilize an egg. The other choices are incorrect because the epididymis does not produce testosterone (B), transport sperm to the urethra (C), or produce seminal fluid (D). Testosterone is primarily produced in the testes, sperm transport to the urethra occurs mainly through the vas deferens, and seminal fluid is produced by the accessory glands.