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    What happens to the arteries in vasodilation and vasoconstriction???:confused:
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    In vasodilation, the blood vessels near the surface of the skin become wider (dilate) to allow more blood to flow near to the skin surface and therefore lose more heat and the body will cool down.
    In vasoconstriction, the blood vessels near the surface of the skin narrow (constrict) to restrict the volume of blood flow near the skin, so less blood transfers heat and the body loses less heat.
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    capillaries
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    (Original post by hotelnotorious)
    capillaries
    It occurs in all blood vessels, mainly arterioles. Not just capillaries, actually.
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    (Original post by AmyT997)
    It occurs in all blood vessels, mainly arterioles. Not just capillaries, actually.
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    What are arteirioles and what do they do in different temperature changes?? Thx
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    (Original post by Sophie454)
    What are arteirioles and what do they do in different temperature changes?? Thx
    Exactly what I said above. I assume you're GCSE in which case you don't need to know about arterioles, just the action of blood vessels.
    But for extra knowledge, arterioles are smaller arteries that join up ateries and capillaries.
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    Ok thank you
 
 
 

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