CAIE IGCSE Biology 11.1.8 Ventilation mechanics
Practise explaining ventilation by linking muscle action, rib and diaphragm movement, thorax volume and pressure changes.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- sequence inspiration from muscle contraction to increased thorax volume and falling pressure
- compare inspiration and expiration using ribs, diaphragm, intercostal muscles and pressure
- interpret diagrams or tables showing how thorax volume and lung pressure change
11.1.8—Ventilation mechanics question 1
Fig. 1.1 is a diagram of the gas exchange system in humans.
Fig. 1.1
Describe the effects on the thorax of contraction of the diaphragm.
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