The temperature of the scrotum is how many degrees Celsius less than the normal body temperature?

Correct option is B

The correct answer is (B) Approx 3°C

Explanation:
• In human males, the testes are located outside the abdominal cavity within a pouch called the scrotum.
• The primary reason for this external anatomical positioning is temperature regulation.
• Spermatogenesis (the biological process of sperm production) requires a temperature slightly lower than the normal core body temperature (which is 37°C or 98.6°F).
• The scrotum optimally maintains a temperature that is about 2 to 3°C (specifically 2-2.5°C in NCERT textbooks, rounded to approx 3°C) lower than the internal body temperature.

Information Booster:
• Thermoregulation Muscles: The dartos and cremaster muscles within the scrotum act as a thermostat. In cold weather, they contract, pulling the testes closer to the body for warmth. In hot conditions, they relax, lowering the testes to cool them via increased surface area.
• Infertility Risks: Persistent exposure to high temperatures (like prolonged hot tub use or tight clothing) can inhibit spermatogenesis and temporarily lower sperm count and motility.

Additional Knowledge:
• Options A, C, D: Temperatures of 12°C, 7°C, or 6°C below core body temperature would be far too cold (hypothermic levels for the tissue) and would completely arrest normal cellular activity and enzyme function necessary for sperm production.