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A-Level Biology OCR A

Skin Body Surface Core Blood Heat Explain Temperature

Front Explain how core body temperature is decreased if it rises above the optimum.
Back Increase in core body temp:
  • Receptors detect change & send signals through nervous system for different responses
  • Vasodilation - arterioles near surface of skin dilate - arteriovenous shunt vessels constrict, forcing blood through capillary networks close to skin - more heat radiated out
  • Increased sweating - spreads across surface of skin & as it evaporates, heat is lost, cooling blood below surface
  • Lowering body hair/feathers - erector pili muscles in skin relax, hair or feathers lie flat - avoids trapping insulating layer of air, maximising ability to cool down

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