The pH value of blood does not appreciably change by a small addition

The pH value of blood does not appreciably change by a small addition of an acid or a base,because the blood

Options

(a) can be easily coagulated
(b) contains iron as a part of the molecule
(c) is a body fluid
(d) contains serum protein which acts as buffer

Correct Answer:

contains serum protein which acts as buffer

Explanation:

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