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Alveoli Picture

 

Alveoli Picture

Alveoli ruptured as a result of emphysema

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Alveoli Picture

The alveoli are the final branchings of the respiratory tree and act as the primary gas exchange units of the lung. The gas-blood barrier between the alveolar space and the pulmonary capillaries is extremely thin, allowing for rapid gas exchange. To reach the blood, oxygen must diffuse through the alveolar epithelium, a thin interstitial space, and the capillary endothelium; CO2 follows the reverse course to reach the alveoli.  
 

 

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Medical Pictures and Photos and Images