IGCSE Biology Notes: Gas Exchange & Breathing
IGCSE biology notes on gas exchange should explain alveolus adaptations and the ribcage/diaphragm changes during inspiration and expiration.
Hub: IGCSE biology notes · Gas exchange exam tips · Respiration notes.
Note essentials
| Topic | Write in notes |
|---|---|
| Alveoli | Thin wall, moist, large surface area, good blood supply |
| Breathing | Intercostal muscles + diaphragm — pressure changes |
| Air composition | % O₂ and CO₂ inhaled vs exhaled |
| Link | Gas exchange ≠ cellular respiration (definitions) |
Diagram
Side view of thorax — label before exam season.
Frequently asked questions
Smoking and gas exchange?
Add short bullet on tar/cilia if on your syllabus section.
Asthma in exams?
Often application — keep example in notes from past paper.
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