Question

The pH value of blood does not appreciably
change by a small addition of an acid or a base,
because the blood
(a) is a body fluid
(b) can be easily coagulated
(c) contains iron as a part of the molecule

Answer 1

Answer contains serum protein which acts as buffer

Answer 2

(d) contains serum protein which acts as buffer.

Explanation:

Option D is missing in the question. It is (d) contains serum protein which acts as buffer.

The pH value of the blood is maintained constant by buffer solution present in the blood. Buffer solutions resist the change in pH values. Hence pH value of blood does not appreciably change by a small addition of an acid or a base.

Option D is the answer.