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15 Cards in this Set

  • Front
  • Back
What taps into the PROTON gradients energy potential?
1. Active tansport
2. Flagellar rotation
4.NADPH Synth
5. Heat Production
6. Electron Potential
What is the concentration of Na+ outside the cell, inside, and the Equilibrium Potential?
out: 145
in: 12
E= +67
What is the concentration of K+ outside the cell, inside, and the Equilibrium Potential?
out: 4
in: 145
E= -98
What are the variables in the Equilibrium Potential Equation?
Ion concentration, Temp., Charge size
Why is there diffusion
concentration gradients are driving forces
What is the Diffusion Potential?
upon opening a barrier that was keeping two different concentrations of ions seperate causes an initial NON-equilibrium situation that eventually reaches equilibrium due to diffusion
How is the Diffuion potential created?
net charge is displaced based on the individual charge and the size of the ion
Do charged particle move at the same velocity along the concentration gradient?
No, charge particles move at different velocities along concentration gradient b/c of size differences and the the friction they create
Is the movement of ions independent?
No, its not independent b/c of the elctro-nuetrality requirement, i.e the net charge has to balance on both sides
What is the Donnan Potential?
the equilibirum potential that results when an IMPERMEABLE ion is present--> affects the distribution of permeable ions
What is the Nerst Potential?
When only 1 of 2 ions is permeable there is an equilibrium potential established that balances the electrostatic and chemical potential gradient which varies with type of ion
What happens to the potential across a membrane if their is no Gradient and No Selectivity?
the potential does not exist
What does the Goldman Hodgkin Katz voltage equation show?
what happens to the Electron potential (mV) when multiple ions with different permeabilities are present
How can we determin the Resting membrane potenial?
By modifying GHK equation to Vm=-60log(permeability ratios)
What define the realisic FLOW across real membranes?