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Reduction in pH of blood will

1. (a) reduce the rate of heart beat.
2. (b) reduce the blood supply to the brain.
3. (c) decrease the affinity of haemoglobin with oxygen.
4. (d) release bicarbonate ions by the liver.

Correct answer: (c) decrease the affinity of haemoglobin with oxygen.

Solution

A fall in blood pH means more H+ ions, which lowers hemoglobin’s affinity for oxygen via the Bohr effect. This helps oxygen dissociate from hemoglobin in tissues, so option (c) is correct.

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