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NEET Sample Paper NEET Sample Test Paper-18

  • question_answer
    Which of the following is the vasoconstrictor substance secreted by mast cells?

    A)  Histamine                  

    B)  Heparin

    C)  Serotonin                   

    D)  Melatonin

    Correct Answer: C

    Solution :

    Mast cells (= plasmatocytes). They produce histamine, heparin and serotonin. Histamine dilates the walls of blood vessels in inflammatory and allergic reactions.  Heparin checks the clotting of blood. Serotonin is a vasoconstrictor substance.


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