A) serotonin
B) heparin
C) histamine
D) All of these
Correct Answer: D
Solution :
Mast cells are found in the matrix of connective tissue. These are modified basophils of blood. Mast cells are oval in shape and secrete heparin (anticoagulant), histamine (vasodilator) and serotonin (vasoconstrictor).
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