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    My question is Can ectotherms undergo vasodilation/vasoconstriction.

    Also can ectotherms sweat, shiver and move hairs up and down

    I think only endotherms can do this but just checking to make sure.
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    No, vasodilation and sweating are a part of thermoregulation, which ectotherms don't do seeing as their body temperature matches the environment. Then have no sweat glands.

    I think they can shiver though (if I remember rightly) although I'm not sure...
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    Ectotherms depend mostly on heat gain and loss through the environment. They don't need to dp vasodilation or constriction to regulate heat loss. I don't know whether they have one or lack a pervisceral nervous system. If so, they might do it pretty well without these processes.

    I don't think they shiver as well. Ever seen a snake out there in the cold, shivering? :P
 
 
 
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