Biology for IGCSE & O level - Gas Exchange In Humans (Section 2 - No. 25)
Which of the following is the primary driving force for gas exchange in the alveoli?
The pumping action of the heart
The difference in partial pressures of gases
The contraction of the diaphragm
The movement of the rib cage
Explanation
Gases diffuse from areas of high partial pressure to areas of low partial pressure.
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