Biology for IGCSE & O level - Gas Exchange In Humans (Section 4 - No. 40)
The gas exchange in the lungs happens because of (Select all that apply)
Difference in the concentration of oxygen and carbon dioxide
The lungs have a large surface area
Blood capillaries are rich in blood
The air pressure
Explanation
A large surface area, a rich blood supply, and a concentration gradient between the air and the blood are all factors that enable gas exchange.
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