Question

At a given $O_2$ concentration, dissociation of oxyhemoglobin will increase if __________.

• A. pH of blood rises
• B. pH of blood falls
• C. $C{O}_2$ concentration of blood falls
• D. Free fatty acid concentration of blood falls

Answer 1

Answer: (B)

pH of blood falls

The oxyhaemoglobin dissociation curve describes the relationship between oxygen saturation of blood and $p{O}_2$. When pH falls in a tissue, means the amount of $C{O}_2$ is also increased and the need for oxygen is increased. Thus, at lower pH haemoglobin releases oxygen faster.

So the correct answer is option B.