1. High pO ₂ , low pCO ₂ , less H ^+ , lower temperature 2. Low pO ₂ , high pCO ₂ , more H ^+ , higher temperature 3. High pO ₂ , high pCO ₂ , less H ^+ , higher temperature 4. Low pO ₂ , low pCO ₂ , more H ^+ , higher temperature

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

Select the favourable conditions required for the formation of oxyhaemoglobin at the alveoli.

1. High pO\(_2\), low pCO\(_2\), less H\(^+\), lower temperature

2. Low pO\(_2\), high pCO\(_2\), more H\(^+\), higher temperature

3. High pO\(_2\), high pCO\(_2\), less H\(^+\), higher temperature

4. Low pO\(_2\), low pCO\(_2\), more H\(^+\), higher temperature

Doubtly Asked 30 Oct 2026 NEET UG 2021 Practice test neet Save WhatsApp Report

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Answer: 1. High pO\(_2\), low pCO\(_2\), less H\(^+\), lower temperature

Oxygen binds haemoglobin best where pO\(_2\) is high and pCO\(_2\) is low.

At the alveoli: high pO\(_2\), low pCO\(_2\), lower H\(^+\) (higher pH) and lower temperature favour oxyhaemoglobin formation (the sigmoid curve shifts left). The opposite conditions, found in tissues, favour release of O\(_2\) (options 2, 4). Option 3 has high pCO\(_2\) and higher temperature, which reduce affinity.

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

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Select the favourable conditions required for the formation of oxyhaemoglobin at the alveoli.

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