BI-1069
Alveoli and gas exchange
Biology · Secondary 3 · Medium · Alveoli and gas exchange
A student compares gas exchange in the alveoli of a healthy person and a person with pulmonary edema (fluid in the alveoli). In a healthy person, which feature of the alveoli most directly helps oxygen diffuse quickly into the blood?
- Thick walls of alveoli to protect against damage
- Thin walls of alveoli and capillaries to shorten diffusion distance
- Low surface area of alveoli to reduce heat loss
- Dry inner surface of alveoli to prevent water loss
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