CAIE IGCSE Biology 11.1.8 Ventilation Mechanics Questions
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: diaphragm and external intercostals contract, ribs lift, thorax expands and pressure falls
- compare inspiration and expiration using diaphragm/intercostal actions, rib movement, volume and pressure changes
- interpret pressure graphs to identify the breathing phase and when ribs are lowered
CAIE IGCSE Biology 11.1.8 Ventilation Mechanics Questions 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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