Why are the human testes situated outside the abdominal cavity within the scrotum?
Answer and explanation
Correct answer: D. Maintains scrotal temperature 2-2.5°C below core body temperature for spermatogenesis
- Step 1: Normal human core body temperature is approximately .
- Step 2: Human spermatogenic germ cells and their meiotic enzymes are thermal-sensitive and cannot produce viable spermatozoa at core abdominal temperatures.
- Step 3: The scrotum acts as a thermoregulatory sac, maintaining the testes at below abdominal temperature, which is essential for viable spermatogenesis.
Answer
To maintain a scrotal temperature lower than normal internal body temperature for spermatogenesis.
Why not the others: Shielding from systemic arterial blood pressure is false (testicular arteries maintain normal perfusion); Preventing capacitation is false (capacitation occurs in the female tract); The scrotum has no connection to the urinary bladder.
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