A) Histamine
B) Heparin
C) Serotonin
D) All of these
Correct Answer: D
Solution :
Mast cells are cells of areolar connective tissue proper. These are modified basophils of blood. Mast cells are oval in shape and secrete heparin (and coagulant), histamine (vasodilator) and serotonin (vasoconstrictor) Heparin, is a mucopolysaccharide which acts in the body as an ant thrombin factor to prevent inn-avascular clotting. Histamine is vasoactive amine, involved in allergic and inflammatory reactions, decreased blood pressure, contraction of smooth muscle. Seroionin is naturally occurring derivative of tryptophan found in platelets and in cells of brain acting as vasoconstrictor and neurotransmitter.
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