Regarding histology of mammary gland

Correct Answer: B

Rationale: Correct Answer: B - Nipple is lubricated by sebaceous gland Rationale: 1. Sebaceous glands produce sebum, which lubricates the skin. 2. The nipple is a part of the skin, and sebaceous glands present in the areola secrete sebum to lubricate the nipple. 3. This lubrication helps protect the nipple during breastfeeding. Summary of other choices: A: Lactiferous duct is mainly lined by simple cuboidal epithelium - Incorrect. The lactiferous duct is lined by stratified cuboidal and columnar epithelium. C: Terminal ductules are seen in lactating mammary gland - Incorrect. Terminal ductules are present in non-lactating mammary glands. D: Interlobular stroma increase in pregnancy - Incorrect. Interlobular stroma does not significantly increase in pregnancy; rather, the alveoli and ducts enlarge during this period.

Correct Answer: C

Rationale: The correct answer is C: acrosome. Lysosomal-like enzymes are found in the acrosome of sperm cells, where they help in breaking down the outer layers of the egg during fertilization. Sertoli cells (A) provide nourishment and support for developing sperm cells. The sperm head (B) contains genetic material but not lysosomal-like enzymes. The sperm tail (D) is responsible for movement and does not contain lysosomal-like enzymes. Therefore, the acrosome (C) is the structure that specifically houses these enzymes for the fertilization process.

Correct Answer: C

Rationale: Step 1: ICSH stands for interstitial cell-stimulating hormone. Step 2: Interstitial cells are found in the testes and produce testosterone. Step 3: ICSH targets these interstitial cells to stimulate testosterone production. Step 4: Therefore, the correct answer is C: interstitial cells. Summary: A, B, and D are incorrect as ICSH does not target the prostate, seminiferous tubule, or seminal vesicle.

Correct Answer: B

Rationale: The correct answer is B: myometrium. The myometrium is the muscular layer of the uterus responsible for contractions during labor and menstruation. It is the largest component of the uterus by weight due to its thick and muscular nature. The broad ligament (A) is a sheet of peritoneum that supports the uterus and other pelvic organs. The round ligament (C) helps support the uterus and is not as significant in weight compared to the myometrium. The endometrium (D) is the inner lining of the uterus that thickens and sheds during the menstrual cycle, but it is not the largest component by weight.

Correct Answer: C

Rationale: The correct answer is C: pituitary. Estrogen is primarily produced by the ovaries, with a small amount also coming from the adrenal glands. The pituitary gland is not a direct source of estrogen production but plays a role in regulating the release of hormones that stimulate estrogen production in the ovaries. The follicle, on the other hand, is a structure within the ovary where estrogen is produced during the menstrual cycle. Therefore, C is the correct answer as the pituitary gland does not directly produce estrogen.