What makes the hair stand up?
Erector muscle
Blood capillaries
Hair folecule
Your hairs lie flat to keep you warm
In hot conditions the blood vessels ❌ (or vasodilation occurs), so the vessels carry more ❌ and therefore carry more ❌. Sweat ❌ produce more sweat which ❌ which takes energy. Therefore more energy / heat is ❌.
Blood vessels _____ in cold conditions.
Contract
Dilate
Your hairs stand up to create a layer of insulation and keep you warm.
Label the diagram.
What happens to the skin in cold conditions?
The blood vessels dilate
The erector muscles contract
Air is trapped in the hairs to create a layer of insulation
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