Body Fluids And Circulation Ques 19

19. In mammals, histamine is secreted by [1998]

(a) histiocytes

(b) lymphocytes

(c) mast cells

(d) fibroblasts

Show Answer

Answer : c

Hints & Solutions

(c) Histamine is a potent vasodilator formed by decarboxylation of the amino acid histidine and released by mast cells in response to appropriate antigens. Mast cells are especially prevalent in the connective tissue of the skin and respiratory tract and in surrounding blood vessels.

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