Gas Exchange At The Alveoli Simplified Revision Notes for GCSE AQA Physical Education

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Gas Exchange At The Alveoli

Gaseous Exchange

Gases move from areas of high concentration to areas of low concentration. If there is more oxygen in the alveoli than the capillaries oxygen will move into the capillaries
Oxygen is diffused into the blood. It binds with the haemoglobin in the blood to form oxyhaemoglobin
Oxyhaemoglobin is transported to the working muscles where it is used for aerobic activity
During aerobic activity carbon dioxide is produced this is removed from the muscles by haemoglobin
Gaseous exchange occurs at the alveoli capillaries and capillaries – muscle tissue

Features That Assist in Gas Exchange

Alveoli have very tiny air sacs with moist thin walls (only one cell thick)
Alveoli have a very large surface area
Alveoli are surrounded by capillaries
It provides a large blood supply

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