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The buffer system present in serum is H2CO3 + NaHCO3 and as we know that a buffer solution resists the change in pH therefore pH value of blood does not change by a small addition of an acid or a base.

1. H2CO3 + NaHCO3
2. Buffer solution resists the change in pH
3. pH value of blood does not change
4. Small addition of an acid or a base

Correct answer: H2CO3 + NaHCO3

Solution

The correct answer is H2CO3 + NaHCO3 because this is the specific buffer system responsible for maintaining the pH of blood by neutralizing small amounts of added acid or base.

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