The adrenergic fibers innervating arterioles are __________ fibers that release __________ and cause __________.
a. sympathetic; epinephrine; vasodilation
b. sympathetic; norepinephrine; vasoconstriction
c. parasympathetic; norepinephrine; vasodilation
d. parasympathetic; epinephrine; vasoconstriction
Answer: b. sympathetic; norepinephrine; vasoconstriction
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