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Alveoli Provide Large Surface Accept Capillaries Area Fast

The lungs are adapted for rapid oxygen exchange due to a large surface area provided by many alveoli and capillaries, thin alveolar and capillary walls creating a short diffusion pathway, and ventilation and circulation maintaining a diffusion gradient.

Os pulmões são adaptados para a rápida troca de oxigênio devido à grande área de superfície fornecida por muitos alvéolos e capilares, às paredes finas dos alvéolos e capilares que criam um caminho de difusão curto, e à ventilação e circulação que mantêm um gradiente de difusão.

Front Describe and explain how the lungs are adapted to allow rapid exchange of oxygen between air in the alveoli and blood in the capillaries around them (5 marks)
Back Many alveoli/alveoli walls folded to provide a large surface area;
Neutral: alveoli provide a large surface area
Many capillaries provide a large surface area;
(So) fast diffusion;
Alveoli or capillary walls/ epithelium/lining are thin/short distance between alveoli and blood;
Accept: one cell thick for 'thin'
Flattened/squamous epithelium;
Accept: endothelial
(So) short diffusion distance/pathway;
(So) fast diffusion;
Ventilation / circulation;
Accept: descriptions for ventilation / circulation
Maintains a diffusion / concentration gradient;

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