They can constrict or dilate because their walls are muscular.
Heat stroke can kill or cause damage to the brain and other internal organs, and is most likely to effect someone doing an activity like, Working out, playing soccer, playing basketball.
Hopefully this could help :)
Answer:The calorie is a unit of energy widely used in nutrition. For historical reasons, two main definitions of calorie are in wide use. The small calorie or gram calorie is the amount of heat energy needed to raise the temperature of one gram of water by one degree Celsius.
Explanation: hope it helps
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Um, I don't understand this question. I would type more clearly on to what you need help with.
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It must be associated with Capillaries.
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