How many seminiferous tubules are found in each lobule?

Correct Answer: B

Rationale: The correct answer is B (50-100) because each lobule in the testis contains multiple seminiferous tubules where sperm production occurs. The average number of seminiferous tubules per lobule ranges from 50 to 100. This is supported by anatomical studies and research on testicular structure. Explanation: A: 1-3 - This is too low as each lobule contains more seminiferous tubules for efficient sperm production. C: 200-300 - This is too high as it overestimates the number of seminiferous tubules per lobule. D: 500 or more - This is excessive and not accurate based on scientific findings. In summary, choice B is correct because it accurately reflects the typical range of seminiferous tubules per lobule, while the other choices either underestimate or overestimate this number.

Correct Answer: A

Rationale: The correct answer is A: first menses. Menarche refers to the onset of a girl's first menstrual period, signifying the beginning of her reproductive years. This event marks the maturation of the reproductive system and the ability to conceive. The other choices are incorrect because menarche does not refer to the permanent cessation of menses (choice B), the first sign of sperm production (choice C), or the time of first ovulation (choice D). Menarche specifically pertains to the first menstrual cycle in females, indicating the initiation of their menstrual and reproductive functions.

Correct Answer: C

Rationale: The correct answer is C: Puberty. Puberty is the stage of development when gametes are produced and secondary sex characteristics appear, marking the beginning of the fertile period. This period typically occurs between the ages of 10 to 14 in females and 12 to 16 in males. A: Teenage - Incorrect. Teenage refers to the age range between 13 to 19 and does not specifically indicate the onset of gamete production and secondary sex characteristics. B: Adolescence - Incorrect. Adolescence is a broader term that encompasses the period from childhood to adulthood, including puberty, but it does not specifically indicate the beginning of the fertile period. D: Juvenile - Incorrect. Juvenile refers to a young organism that has not reached sexual maturity and does not signify the beginning of gamete production and secondary sex characteristics.

Correct Answer: C

Rationale: The correct answer is C: Perimetrium. The perimetrium is the outermost layer of the uterus and consists of a thin serous layer of connective tissue. This layer provides support and protection to the uterus. Rationale: 1. Peritoneum (A) is the serous membrane that lines the abdominal cavity, not the outermost layer of the uterus. 2. Pericardium (B) is the membranous sac that surrounds the heart, not related to the uterus. 3. Pericyte (D) is a type of cell found in blood vessels and involved in vascular function, not a layer of the uterus. In summary, the perimetrium is the correct answer as it is the specific layer that forms the outer covering of the uterus, providing structural support and protection.

Correct Answer: B

Rationale: The correct answer is B: Gynecomastia. Gynecomastia refers to the abnormal enlargement of male breast tissue, which can be unilateral or bilateral. This condition is commonly caused by hormonal imbalances, medication side effects, or underlying medical conditions. Mastodynia (A) refers to breast pain, Mammocele (C) is a term for a breast cyst, and Teratoma (D) is a type of tumor that contains multiple types of tissue. Therefore, the correct term for male breast enlargement is gynecomastia.