Biology / Unit 2 Bio 0360 short lesson, about 20 seconds
Electrochemical Gradient
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The idea
An electrochemical gradient combines a charged particle's concentration gradient with the membrane's electrical charge difference, together setting its net direction.
In practice
A cell's negative interior charge draws sodium inward, and sodium's own concentration gradient favors moving inward too.
Where people slip
For some ions both gradients pull the same way; for others, like potassium, they pull opposite ways.
Your place on the trail
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