Topic: Breathing and respiration: mechanism, exchange and transport of gases, volumes, disorders· Human Physiology

Reduction in pH of blood will :

1. reduce the rate of heart beat.

2. reduce the blood supply to the brain.

3. decrease the affinity of hemoglobin with oxygen.

4. release bicarbonate ions by the liver.

Doubtly Asked 30 Oct 2026 NEET UG 2016 Phase 1 Practice test neet Save WhatsApp Report

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Answer: 3. decrease the affinity of hemoglobin with oxygen.

A fall in blood pH (more H⁺, higher CO₂) shifts the oxygen dissociation curve to the right (the Bohr effect). Haemoglobin therefore holds oxygen less tightly, which helps it release O₂ to tissues.

Acidity actually increases the heart rate and brain blood flow, and the liver does not release bicarbonate in response, so the other options are wrong.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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Reduction in pH of blood will :

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