Question

Histamine is involved in allergic reaction because it's a vasodilator. Is it true?

Answer 1

Yes. Histamine is secreted by mast cells during allergic reaction that dilated the blood vessel preventing from inflammation.

Answer 2

Ya it is true as ........
Histamine, operating through H1and H2 receptors, causes arteriolar vasodilation, venous constriction in some vascular beds, and increased capillary permeability .
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