Hajara K.

asked • 04/17/21

How does pottasium comes inside a cell after repolarization

In resting state the pottasium is inside the cell and during repolarization it will go out of cell so to continue the next cycle pottasium must come inside the cell how can it happen?

Jonathan H.

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In cardiac cell activity, Ca entered the cell through open slow channels, too small for Na to diffuse into the cell. After Ca activates the gated Na fast channels, Na rushes into the cell which facilitates the expulsion of K+ (depolarization). It is at this point that Ca attaches to and operates the cell wall Na/K pump, expending ATP. The pumps are chambers that grasp Na ions inside the cell then pivot to open to the extracellular environment to expel the Na. The pumps then close, grasping K+, and reverse the pivot to introduce K+ back into the cells interior (repolarization). This process is also known as active transport.
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04/19/21

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Jean B. answered • 04/18/21

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One significant way is through the Na++/K+ ATPase that help re-establish the electrochemical gradient (resting potential)! They bring K+ back in and send Na++ back out. Opposite of what happens during an action potential.


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