Comprehensive, concise notes designed to help students to revise the ‘Gas exchange’ unit for CIE AS Biology (9700). Aligned with the updated Cambridge syllabus (2025-27), editable version included so also easily adaptable for other syllabi or levels. PDF version ready to print also included.
The unit is organised into clear sections:
- Gas exchange.
- Lungs structure
- Trachea, bronchi and bronchioles.
- Warming and cleaning the air.
- Structure of alveoli.
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