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Cause Vasoconstriction or Vasodilation?

MCAT practice
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vasoconstriction
increase sympathetic firing
vasodilation
decrease sympathetic firing (allow parasympathetic activity to occur)
vasodilation
heat
vasoconstriction
cold
vasodilation
histamine
vasodilation
decrease in body's oxygen
vasodilation
increase in body's carbon dioxide
vasoconstriction
increase in body's oxygen
vasoconstriction
decrease in body'c carbon dioxide
vasoconstriction
endothelin
vasodilation
nitric oxide