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### 15 Cards in this Set

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 Voltage -a transmembrane difference in electrical potential -a form of potential energy - V=Q/C Capacitance -the amount of electric charge stored/separated for a given potential -C=Q/V Resistance -the property of a conductor which impedes charge movement -R=V/I Current -rate of movement of charge -I=V/R How selective are voltage gated ion channels? -very selective for their named ions How selective are ligand gated ion channels? -much less selective -they are more or less "valence" selective (ex. they either select for pos or neg ions) Resting potential -(inside potential) minus (outside potential) Is a cell's resting potential always the same? -no, cells can have different potentials and different times What does the driving force that pushes an ion thru its channel depend on? -the concn gradient of the ion across the membrane -the potential difference across the membrane Nernst Eqn -predicts the equilibrium potential of an ion across a membrane -E=(58/z)log{[X2]/[X1]} -z=ion's valence Goldman Eqn -predicts the value of the membrane potential in a multi ion environment if we know the permeabilities of the membrane to the relative ions What are the concentrations of Na+ and K+ relative to the cell membrane? -high Na+ outside -high K+ inside Are Ca2+ levels higher inside or outside of the cell at rest? -outside Where do ion exchange pumps get their energy? -by using the electrochemical gradient of other ions, usually Na+ Which way does the Na+/K+ pump move each ion? -Na+ out -K+ in -restores resting potential after an action potential