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NEET 2016 Phase 1 · BiologyPrevious Year Question

Reduction in pH of blood will:

Answer: (C) Decrease the affinity of hemoglobin with oxygen. Answer: (c) Decrease the affinity of hemoglobin with oxygen Solution: A reduction in blood pH means a rise in H+ (hydrogen ion) concentration.

  1. A.Reduce the rate of heart beat
  2. B.Reduce the blood supply to the brain
  3. C.Decrease the affinity of hemoglobin with oxygen✓
  4. D.Release bicarbonate ions by the liver

Correct Answer

(C) Decrease the affinity of hemoglobin with oxygen

Solution & Explanation

Answer: (c) Decrease the affinity of hemoglobin with oxygen Solution: A reduction in blood pH means a rise in H+ (hydrogen ion) concentration. Higher H+ concentration shifts the oxygen dissociation curve so that oxygen is released from oxyhaemoglobin (the Bohr effect), i.e., haemoglobin's affinity for O2 decreases. NCERT lists high H+ concentration among the conditions favouring dissociation of oxygen from oxyhaemoglobin. NCERT: Ch 14, p.189, line 28 — "high pCO2, high H+ concentration and higher temperature exist"

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