Class 11 Zoology simulations · Breathing and Exchange of Gases

Mechanism of breathing (bell-jar model)

Pull the rubber diaphragm down: the volume of the jar increases, pressure falls and the balloons (lungs) inflate.

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What to notice

Inspiration happens when intra-pulmonary pressure falls below atmospheric pressure.

Key relation

Boyle’s law: P ∝ 1/V at constant temperature

Try this

Pull the diaphragm further. How does the pressure change?

What you can change

• Diaphragm pull (depth when automatic): 0 to 100 %
• Breathe automatically: choose Yes, No — use the slider

More in Breathing and Exchange of Gases

• Exchange of gases: partial pressures
• Spirometer: lung volumes and capacities
• Oxygen–haemoglobin dissociation curve

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