The alveoli are surrounded by capillaries because this is where gas exchange occurs, with oxygen diffusing into the blood and carbon dioxide leaving the blood.
Les alvéoles sont entourées d'un réseau de capillaires car c'est là que se produit l'échange gazeux ; l'oxygène diffuse dans le sang et le dioxyde de carbone quitte le sang.
| Front | Why is the alveoli surrounded by a network of capillaries? |
|---|---|
| Back | Because this is where gas exchange occurs. Oxygen diffuses out of the alveoli into the blood being carries by the capillaries. At the same time, carbon dioxide diffuses out of the blood in the capillaries into the alveoli. |
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