Diffusion of gases between alveoli and blood is rapid due to slowed red blood cells, reduced diffusion distance with capillary walls, thin alveolar and capillary walls, blood flow maintaining a concentration gradient, and the large surface area of alveoli and capillaries.
A difusão de gases entre os alvéolos e o sangue é rápida devido ao abrandamento dos glóbulos vermelhos, à redução da distância de difusão com as paredes capilares, às paredes finas dos alvéolos e capilares, ao fluxo sanguíneo que mantém um gradiente de concentração e à grande área de superfície dos alvéolos e capilares.
| Front | Why is diffusion of gases between alveolar and blood rapid |
|---|---|
| Back | Red blood cells slowed down as they pass pulmonary capillaries allowing more time for diffusion. The distance between alveolar air and red blood cells reduced as red blood cells flattened against capillary walls. Walls of alveoli and capillaries very thin creating a short diffusion path Blood flow from pulmonary capillaries maintains a concentration gradient Alveoli and pulmonary capillaries have a large total surface area. |
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