Why does the cell need Na+/Ka+ (Sodium potassium pump)
[From: ] [author: ] [Date: 11-05-11] [Hit: ]
. the gradients of Na+ and K+ help balance out other ions in the body too!-The pump is also necessary to regulate the #s of Na+ and K+ in order for the neuron to return to the polarized state from its hyperpolarized state after an action potentialAction Potential occurs when a strong enough stimulus affects the neuron, which causes the axon hillock to change the chemical stimulus into an electrical stimulus. This stimulus causes the neuron to leave its polarized (resting) stage, and enter into a depolarized state when Na+ gates open,......
This is just one example, similar types of symporters are present in many many cells (another example is the movement of Iodine across the cell membrane in the thyroid due to the K+ gradient)
A lot of detail, sorry. But I hope this helps give you some examples. You are right in saying it maintains balance--but not just of Na+ and K+... the gradients of Na+ and K+ help balance out other ions in the body too!
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The pump is also necessary to regulate the #'s of Na+ and K+ in order for the neuron to return to the polarized state from its hyperpolarized state after an action potential
Action Potential occurs when a strong enough stimulus affects the neuron, which causes the axon hillock to change the chemical stimulus into an electrical stimulus. This stimulus causes the neuron to leave its polarized (resting) stage, and enter into a depolarized state when Na+ gates open, which introduces an influx of Na+ ions into the cell. When it peaks, Na+ gates close, and the cell becomes repolarized when K+ gates open instead. Then, K+ gates close when the cell becomes hyperpolarized (below what its resting stage was), and it becomes polarized afterwards
I think it had to do with 3 Na+'s and 2 K+'s, with ATP (which becomes ADP + P)
hope it helps in some way :0
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Electrolyte balance, in the body cells. The inside of a cell will be more negative than the outside.
An influx of sodium followed by a release of potassium make up an action potential.
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The pump serves as a worker in the active transport and maintains the potential across the cell.
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