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Gradient Describe Oxygen Air Reaches Capillaries Surrounding Alveoli

Oxygen in the air reaches capillaries surrounding alveoli in the lungs via the trachea, bronchi, and bronchioles, moving down pressure and diffusion gradients across the alveolar epithelium and capillary endothelium.

O oxigênio no ar chega aos capilares que circundam os alvéolos através da traqueia, brônquios e bronquíolos, movendo-se por gradientes de pressão e difusão através do epitélio alveolar e endotélio capilar.

Front Describe how oxygen in the air reaches capillaries surrounding alveoli in the lungs. Details of breathing are not required. [4 marks]
Back 1. Trachea and bronchi and bronchioles;
2. Down pressure gradient;
3. Down diffusion gradient;
4. Across alveolar epithelium;
5. Across capillary endothelium/epithelium;

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