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Published byMagnus Harper Modified over 6 years ago
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Respiratory System Lesson Objectives: Recap on O2 journey
Characteristics of alveoli Function of alveoli
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Alveoli How do we breathe?
Lungs take in oxygen & breathe out carbon dioxide This gas exchange takes place in the alveoli of the lungs.
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Characteristics of Alveoli
Each alveolus is smaller than a grain of salt. The walls are thin and moist Surrounded by a capillary network (tiny blood vessels)
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Characteristics of Alveoli
Why do you think there are millions of tiny ones rather than one big one? Surface area – the exchange of gases is far more efficient if there is a greater surface area for it to diffuse through.
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