Channels, Pumps, and Ion Movement
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11 Terms
what channel is open at rest?
leak potassium channels
what happens through leak potassium channels?
potassium slowly leaks out of the neuron
what maintains high potassium inside the neuron?
the sodium-potassium pump
what does the sodium-potassium pump help do?
maintain concentration gradients and restore ion balance
what 2 forces determine ion movement?
concentration/chemical forces and electrical forces
what is the concentration gradient?
movement from high concentration to low concentration
what is the electrical force?
attraction or repulsion based on charge
why does potassium tend to move outward through leak channels;s?
its chemical force outward is stronger than the electrical force pulling it inward
why is sodium strongly driven inward?
both concentration and electrical forces push sodium into the neuron
why doesn’t sodium rush in at rest?
sodium channels are closed at rest