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Describe Path Oxygen Alveolus Blood Marks Alveolar Epithelium; 

Oxygen moves from the alveoli to the blood by passing through the alveolar epithelium and then the capillary endothelium.

Oxygen moves from the alveoli to the blood by passing through the alveolar epithelium and then the capillary endothelium.

Front Describe the path by which oxygen goes from an alveolus to the blood ( 2 marks)
Back Through alveolar epithelium; 
Through capillary epithelium/endothelium;

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