BI-2224
Alveoli and gas exchange
Biology · Secondary 4 · Easy · Alveoli and gas exchange
In humans, which feature of the alveolus most directly helps to maintain a steep diffusion gradient for oxygen during gas exchange?
- Alveoli are lined with cilia that sweep mucus away
- Alveoli are surrounded by elastic cartilage rings
- Ventilation continually replaces the air in the alveoli
- Blood in the capillaries flows very slowly and remains still
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