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This lesson covers gas exchange in the lungs — specifically the structure and adaptations of the alveoli — as required by the Edexcel GCSE Combined Science specification (1SC0). You need to explain how oxygen and carbon dioxide are exchanged between the air and the blood, describe how alveoli are adapted for efficient gas exchange and explain the role of ventilation.
The respiratory system brings air into and out of the body so that gas exchange can take place in the lungs.
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