Partial Pressure and the Diffusion Gradient
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State
A gas's partial pressure is the portion of total pressure it contributes; gas diffuses across a surface from higher to lower partial pressure until equalized.
Show
Oxygen's higher partial pressure in inhaled air than in blood drives it into the bloodstream.
Watch for
Each gas follows its own gradient — oxygen and carbon dioxide diffuse opposite directions at once.
Builds on
- Nothing — this is a starting point.