Class 11 Zoology simulations · Breathing and Exchange of Gases

Exchange of gases: partial pressures

Follow blood along a pulmonary or tissue capillary and watch O₂ and CO₂ diffuse down their partial-pressure gradients.

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What to notice

In the lungs O₂ moves from alveoli (104 mm Hg) into blood (40); CO₂ moves from blood (45) into alveoli (40).

Key relation

Diffusion rate ∝ partial-pressure gradient

Try this

Switch to tissues: in which direction does each gas move now?

What you can change

• Site: choose Alveolus (lungs), Body tissue
• Position along capillary: 0 to 100 %

More in Breathing and Exchange of Gases

• Mechanism of breathing (bell-jar model)
• Spirometer: lung volumes and capacities
• Oxygen–haemoglobin dissociation curve

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