What does histamine do in an allergic reaction?
A) Histamine causes constriction of arterioles and capillaries and dilation of the bronchial muscle.
B) Histamine causes dilation of arterioles and capillaries and constriction of the bronchial muscle.
C) Histamine causes constriction of arteries and veins and increases systematic blood pressure.
D) Histamine causes dilation of arteries and veins and decreases systematic blood pressure.
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