Which of the following cells secrete testosterone

Correct Answer: D

Rationale: Rationale: 1. Leydig cells are located in the testes and are responsible for secreting testosterone. 2. Testosterone is a male sex hormone crucial for the development of male reproductive tissues. 3. Spermatocytes and oocytes are involved in gamete production, not testosterone secretion. 4. Anterior pituitary cells secrete hormones like FSH and LH, not testosterone. Summary: Leydig cells secrete testosterone in the testes, making them the correct choice. Spermatocytes, oocytes, and anterior pituitary cells are not involved in testosterone secretion.

Correct Answer: B

Rationale: The correct answer is B: neonatal. "Neo-" means new or recent, and "-natal" refers to birth. Therefore, neonatal means pertaining to new birth. Choice A, antenatal, refers to the period before birth. Choice C, neonate, refers to a newborn baby. Choice D, newborn, simply means a recently born baby without specifying the time frame as "neonatal" does.

Correct Answer: B

Rationale: Step 1: The epididymal duct is a coiled tube located on the posterior surface of the testis. Step 2: It continues as the deferent duct (vas deferens) which is responsible for transporting sperm from the epididymis to the ejaculatory duct. Step 3: Therefore, choice B is correct as the epididymal duct indeed continues as the deferent duct. Summary: A: Incorrect - The epididymal duct is not located within the testis. C: Incorrect - The testicular efferent ducts are separate from the epididymal duct. D: Incorrect - The epididymal duct is considered part of the male reproductive system within the scrotum, not outside it.

Correct Answer: C

Rationale: Step-by-step rationale: 1. The prostate is an accessory gland because it produces and secretes fluid that nourishes and protects sperm. 2. It is not located under the urinary bladder (A) but surrounds the initial segment of the urethra (B). 3. The prostate does not secrete androgenic hormones (D); instead, it secretes prostate-specific antigen (PSA) and enzymes. 4. Thus, the correct answer is C because it accurately describes the function of the prostate as an accessory gland of the male reproductive system.

Correct Answer: B

Rationale: Step-by-step rationale: 1. Testosterone is a male sex hormone responsible for developing secondary sexual characteristics. 2. Voice deepening is a well-known secondary sexual characteristic influenced by testosterone. 3. Testosterone affects the larynx, causing vocal cords to lengthen and thicken, leading to a deeper voice. 4. Skeleton development is mainly influenced by growth hormones, not testosterone. 5. Secretory modifications in spermatogenic epithelium are regulated by other hormones like FSH and LH, not testosterone. 6. The distribution of excess fat is influenced by various factors like genetics and metabolism, not specifically testosterone. Summary: Voice deepening (choice B) is the correct answer as it is a well-known secondary sexual characteristic influenced by testosterone. Choices A, C, and D are incorrect as they are not directly influenced by testosterone in the context of secondary sexual characteristics.