Class 11 Zoology simulations · Breathing and Exchange of Gases

Oxygen–haemoglobin dissociation curve

See how the % saturation of haemoglobin depends on pO₂, and how CO₂, acidity and temperature shift the curve.

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What to notice

In tissues (low pO₂, high pCO₂, high H⁺, higher temperature) oxyhaemoglobin dissociates and releases O₂.

Key relation

Sigmoid curve ; high pCO₂, H⁺ or temperature → shift right (O₂ released)

Try this

Raise pCO₂ and temperature together. What happens to saturation at 40 mm Hg?

What you can change

• pO₂: 0 to 120 mm Hg
• pCO₂: 20 to 70 mm Hg
• Temperature: 34 to 42 °C
• pH: 7 to 7.7

More in Breathing and Exchange of Gases

• Mechanism of breathing (bell-jar model)
• Exchange of gases: partial pressures
• Spirometer: lung volumes and capacities

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