Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
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 |