BI-1041
Alveoli and gas exchange
Biology · Secondary 3 · Medium · Alveoli and gas exchange
Which feature of the alveoli most directly allows oxygen to diffuse quickly into the blood capillaries?
- Their walls are only one cell thick, shortening the diffusion distance.
- They contain many chloroplasts to absorb more oxygen.
- They have thick, muscular walls to pump air faster.
- They are filled with blood to prevent any air spaces.
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