BRAINCAKEAlveoli
Alveoli are the specialised gas exchange surface in the lungs.
They are thin, blindly ending air sacs 100-300 μm in diameter. There are about 200 million per lung.
They are thin and delicate and easily damaged so are located inside the body for protection.
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Key terms in this lesson
- diffusion
- The net passive movement of molecules or ions from a region of higher concentration to a region of lower concentration, down a concentration gradient.
More in Exchange of Gases
- The Lungs
- Mechanism of Breathing
- Inspiration
- Expiration
- Role of Alveoli in Gas Exchange
- Correlation and Causation
- Risk Factors for Lung Disease
- Smoking and Lung Cancer
All 28 lessons in Exchange of Gases · All AQA AS-level Biology topics