Biology / Unit 13 Bio 3141 short lesson, about 20 seconds
Partial Pressure and the Diffusion Gradient
Captions available
The idea
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.
In practice
Oxygen's higher partial pressure in inhaled air than in blood drives it into the bloodstream.
Where people slip
Each gas follows its own gradient — oxygen and carbon dioxide diffuse opposite directions at once.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
Builds on
- Nothing. This is a starting point.
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