Viper bite

Discussion in 'AIIMS Nov 2013' started by samuel, Dec 12, 2014.

  1. samuel

    samuel New Member

    Viper bite
    a) Musculo-toxic
    b) Neuro-toxic
    c) Histotoxic
    d) Vasculotoxic

    Answer: Vasculotoxic
    Explanation:
    1. Neurotoxins: Alfa-neurotoxins are a large group
    of postsynaptic toxins. Alfa -neurotoxins also
    attack cholinergic neurons. They mimic the
    shape of the acetylcholine molecule and
    therefore fit into the receptors → they block the
    ACh flow → feeling of numbness and paralysis.
    Snake examples: king cobra, sea snakes,
    many-banded krait and cobras
    2. Cardiotoxins are components that are
    specifically toxic to the heart. They bind to
    particular sites on the surface of muscle cells
    and cause depolarization and prevent muscle
    contraction. These toxins may cause the heart
    to beat irregularly or stop beating, causing
    death. Snake example: mambas, and some
    cobra species
    3. Hemotoxins cause hemolysis, the destruction
    of red blood cells (erythrocytes), or induce
    blood coagulation (clotting). Snake example:
    most vipers and many cobra species.

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