Biology / Unit 2 Bio 0362 short lesson, about 20 seconds
The Sodium-Potassium Pump
Captions available
The idea
The sodium-potassium pump uses ATP to move three sodium ions out for every two potassium ions in, both against their gradients.
In practice
This pump keeps sodium concentrated outside animal cells and potassium inside, the imbalance behind Bio 0360's gradient.
Where people slip
The unequal ratio, three out for two in, makes this pump electrogenic, shifting the interior slightly more negative each cycle.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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