THE LUNGS and GAS EXCHANGE - GCSE 9-1 Biology Revision / A* Grade / IGCSE Biology

In this video you will learn the following key revision points for the Science/Biology GCSE exam

- Alveoli are small air filled sacs in the lungs
- They have a thin membrane and high blood supply
- This increases the rate of diffusion
- Oxygen enters the blood from the alveolus
- Carbon Dioxide enters the alveolus from the blood and is then exhaled

You will also learn many more including key points about breathing rates

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