Estrogen is required for normal reproductive function in the male. Where is the principal site of estrogen synthesis in the male?

Correct Answer: C

Rationale: Rationale: 1. The correct answer is C: Liver cells. The liver is the principal site of estrogen synthesis in the male. 2. Liver cells contain the enzyme aromatase, which converts androgens into estrogens. 3. Estrogen plays a crucial role in maintaining normal reproductive function in males. 4. Leydig cells (Choice A) are responsible for testosterone production, not estrogen synthesis. 5. Osteoblasts (Choice B) are bone cells involved in bone formation, not estrogen synthesis. 6. Prostate cells (Choice D) are involved in prostate function, not estrogen synthesis.

Correct Answer: B

Rationale: The correct answer is B: The fetal liver stores enough iron to meet the infant’s needs until the third month. During pregnancy, the fetus accumulates iron stores in the liver from the mother, which can sustain the infant's iron needs for the first few months of life. This stored iron is gradually utilized by the infant as the maternal iron supply diminishes post-birth. Explanation of why the other choices are incorrect: A: Growth of the infant does require iron even in the early months for various metabolic processes and functions. C: Synthesis of new red blood cells starts shortly after birth, not necessarily after 3 months. D: Myoglobin is not directly related to iron supplementation needs in infants and is unrelated to the timing of iron supplementation requirements.

Correct Answer: C

Rationale: Step 1: Maternal and fetal adrenal glands secrete androgenic steroids. Step 2: Placenta uses these androgenic steroids to form estrogen. Step 3: Increased estrogen levels can lead to body hair growth. Therefore, the correct answer (C) is supported by the process of androgenic steroids being secreted by the adrenal glands, utilized by the placenta to form estrogen, resulting in increased body hair growth. Summary: A (The ovaries secrete some testosterone along with estrogen) is incorrect as testosterone is not primarily secreted by the ovaries late in pregnancy. B (The fetal ovaries and testes secrete androgenic steroids) is incorrect as the primary source of androgenic steroids in this context is the adrenal glands, not fetal ovaries or testes. D (The placenta secretes estrogen, some of which is metabolized to testosterone) is incorrect as the main source of estrogen in this scenario is from the and

Correct Answer: A

Rationale: The correct answer is A: Sperm. Sperm is the mature male reproductive cell capable of fertilizing an egg. It carries genetic material and is designed for the process of fertilization. Spermatid (B) is an immature sperm cell not yet capable of fertilizing an egg. Primary spermatocyte (C) is a cell undergoing meiosis to produce spermatids. Spermatogonium (D) is a stem cell that gives rise to spermatocytes but is not directly involved in fertilization. Therefore, only sperm (A) is suitable for fertilizing an egg.

Correct Answer: D

Rationale: The correct answer is D: Bulbourethral glands. These glands produce thick, clear mucus that cleanses the penile urethra of acidic urine before ejaculation. This mucus helps neutralize the acidity of urine, creating a more hospitable environment for sperm to travel through. The other choices are incorrect because: A: Testes produce sperm, not mucus. B: Seminal vesicles produce a fluid rich in fructose to nourish sperm. C: Prostate produces a milky fluid that aids in sperm motility.