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← Human Biology notes
Edexcel IGCSE·Human Biology·IGCSE Human Biology

Breathing & Gas Exchange

12 min read

The breathing system, the mechanism of ventilation, and gas exchange in the alveoli.

The breathing system supplies oxygen for respiration and removes carbon dioxide.

The pathway of air

Air travels: nose/mouth → trachea → bronchi → bronchioles → alveoli (air sacs).

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