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  1. The main buffer system of the human blood is

    2. A.

     H2CO3 - HCO3
    B.

     H2CO3 - CO32-
    C.

     CH3COOH - CH3COO-
    D.

     NH2CONH2 - NH2CONH+

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    Answer : Option A

    Explanation :

    Bicarbonate buffer is the most important buffer system in blood plasma (generally in the extracellular fluid). This buffer consists of weak acid H2CO3(pK1 = 6,1) and conjugated base HCO3- (bicarbonate).

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