Q.137. Substance causing vasodilation and increased capillary permeability during allergic reactions is
(1) Globulin
(2) Albumin
(3) Heparin
(4) Histamine

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Please find below the solution to the asked query    
          
Option (4) is correct.

Histamine is a natural chemical produced by the body in response to foreign organisms. It is involved in allergic reaction (increase capillary permeability) and also causes vasodilation (relaxation of muscular walls of blood vessels).

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