Humans keep their internal conditions almost constant.Body temperature is kept within a narrow range. When the core body temperature is too low, this is detected by the thermoregulatory centre in the brain. Describe how the body responds when a decrease in core body temperature is detected. – 6023

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1. Blood vessels near the skin get narrower — this is called vasoconstriction.

   This means less blood flows to the skin, so less heat is lost to the air.

   Your muscles start to shiver when you’re cold.

   Shivering is when muscles quickly contract and relax.

   This needs more respiration, which releases heat to warm you up.

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