Transcription of Membrane Potential
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Membrane Potential
7. Membrane Potential The Resting Membrane Potential Results From the tances. These electrical signals-receptor potentials, Separationof ChargesAcross the Cell Membrane synaptic potentials, and action potentials-are all pro- The Resting Membrane Potential Is Determined by Resting duced by temporary changes in the current flow into Ion Channels and out of the cell that drive the electrical Potential RestingChannelsin Glial Cells Are Selectivefor acrossthe cell Membrane away from its resting value. PotassiumOnly This current flow is controlled by ion channels in RestingChannelsin Nerve Cells Are Selectivefor Several the cell Membrane . We can distinguish two types of ion Ion Species channels-resting and gated-by their distinctive roles PassiveFlux of Sodium and PotassiumIs Balancedby in neuronal signaling. Resting channels normally are Active Pumping of the Ions open and are not influenced significantly by extrinsic Chloride Ions May Be PassivelyDistributed factors, such as the Potential acrossthe are primarily important in maintaining the resting The Balanceof Ion Fluxes That Gives Rise to the Resting Membrane Potential Is Abolished During the Action Membrane Potential , the electrical Potential across the Potential Membrane in the absenceof signaling.
consider how the passive properties of neurons-their resistive and capacitive characteristics-contribute to local signaling within the neuron. In Chapter 9 we shall examine how voltage-gated Na +, K+, and Ca2+ chan-nels generate the action potential, the electrical signal conveyed along the axon. Synaptic and receptor poten-
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