Which of the following cells may eventually become spermatozoa?

Correct Answer: C

Rationale: The correct answer is C: Spermatogonia. Spermatogonia are the male germ cells that undergo mitosis to produce more spermatogonia or differentiate into primary spermatocytes, which eventually develop into spermatozoa through meiosis. Sertoli cells (A) and Sustentacular cells (B) are somatic cells within the testes that support and nourish developing sperm cells, but they do not give rise to spermatozoa. Chief cells (D) are typically found in the stomach and are responsible for producing pepsinogen, unrelated to sperm production.

Correct Answer: B

Rationale: The correct answer is B: Mesonephric (Wolffian) ducts. The male reproductive system arises from the mesonephric ducts, which develop into structures like the epididymis, vas deferens, and seminal vesicles. The mesonephric ducts are responsible for transporting sperm from the testes to the urethra. The other choices are incorrect because A (Paramesonephric ducts) develop into the female reproductive system, C (FSH) is a hormone involved in the regulation of reproductive processes but does not directly give rise to the male reproductive system, and D (aldosterone) is a hormone involved in electrolyte balance and has no role in male reproductive system development.

Correct Answer: D

Rationale: The correct answer is D: Nipple. The mammary papilla refers to the nipple, the protruding part of the breast where milk is released during breastfeeding. It is the anatomical structure that connects the lactiferous ducts to the outside of the body. The other choices are incorrect because: A: Areola is the darker area surrounding the nipple. B: Lactiferous duct is the tube that carries milk from the mammary glands to the nipple. C: Sinuses are not directly related to the mammary papilla.

Correct Answer: D

Rationale: The correct answer is D: Human chorionic gonadotropin (hCG). This hormone is released from the placenta during pregnancy and is essential for maintaining the corpus luteum, which in turn produces progesterone to support the pregnancy. hCG is also the hormone detected in pregnancy tests. Choice A (Follicle stimulating hormone) and B (Luteinizing hormone) are involved in the menstrual cycle, not specifically released from the placenta. Choice C (Estrogen) is produced by the ovaries and not directly released from the placenta.

Correct Answer: C

Rationale: The correct answer is C: Eunuch. When a male is castrated before puberty, he becomes a eunuch because castration removes the testes, leading to a lack of testosterone production and loss of male secondary sexual characteristics. This results in a eunuch having a more neutral appearance and lacking the ability to reproduce. A: Choosing "Female" is incorrect because castration does not change the individual's genetic sex. B: Selecting "Cretin" is incorrect as cretinism is a condition caused by severe thyroid hormone deficiency, not related to castration. D: Opting for "Potent" is incorrect as castration leads to the loss of reproductive ability, making the individual infertile.