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15 Cards in this Set

  • Front
  • Back
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