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Ch. 3 Membrane Potential
Terms in this set (10)
Explain how potassium leakage channels create negative charge in cell.
The diffusion of potassium ions through leakage channels create a net electric charge in the cell, as positive potassium ions diffuse down its concentration gradient, negative protein ions & other anions are left behind. The electrical potential created then pulls potassium back into cell and then repeats the cycle.
The chemical and electrical forces on potassium are equal and opposite when the membrane potential is ___. This is considered the ___ potential
The resting membrane potential for many neurons is ___
At -70mV, the resting membrane potential, K+ leaks ___ of the neuron and Na+ leak ___ the neuron
The ___ pump maintains the membrane potential by transporting ions ___ their electrochemical gradient by using ___. This pumps transports ___ Na+ out and ___ K+ ions in.
Na+K+, against, ATP, 3, 2
The Na+K+ pump does not create the membrane potential its job is to maintain it at ___
The cells permeability to ___ ions also contribute to the cells membrane potential
The difference in the concentration of a particular substance between two adjacent areas; provides the chemical force that causes ions to move
The electrical force across a cell membrane that results from the separation of charge across that membrane; also called the membrane potential
The combined electrical and chemical forces on an ion; determines the net movement of that ion
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