BI-2254
Alveoli and gas exchange
Biology · Secondary 4 · Medium · Alveoli and gas exchange
In a healthy person, which feature of the alveolus most directly helps to maintain a steep diffusion gradient for oxygen between the air in the alveoli and the blood in the capillaries?
- Each alveolus has a dense network of capillaries surrounding it
- The inner surface of each alveolus is lined with cilia
- The walls of the alveoli are made of thick muscle tissue
- Each alveolus contains many elastic fibres that store oxygen
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