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15 Cards in this Set
- Front
- Back
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What taps into the PROTON gradients energy potential?
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1. Active tansport
2. Flagellar rotation 3.ATP 4.NADPH Synth 5. Heat Production 6. Electron Potential |
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What is the concentration of Na+ outside the cell, inside, and the Equilibrium Potential?
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out: 145
in: 12 E= +67 |
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What is the concentration of K+ outside the cell, inside, and the Equilibrium Potential?
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out: 4
in: 145 E= -98 |
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What are the variables in the Equilibrium Potential Equation?
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Ion concentration, Temp., Charge size
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Why is there diffusion
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concentration gradients are driving forces
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What is the Diffusion Potential?
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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
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How is the Diffuion potential created?
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net charge is displaced based on the individual charge and the size of the ion
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Do charged particle move at the same velocity along the concentration gradient?
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No, charge particles move at different velocities along concentration gradient b/c of size differences and the the friction they create
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Is the movement of ions independent?
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No, its not independent b/c of the elctro-nuetrality requirement, i.e the net charge has to balance on both sides
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What is the Donnan Potential?
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the equilibirum potential that results when an IMPERMEABLE ion is present--> affects the distribution of permeable ions
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What is the Nerst Potential?
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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
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What happens to the potential across a membrane if their is no Gradient and No Selectivity?
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the potential does not exist
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What does the Goldman Hodgkin Katz voltage equation show?
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what happens to the Electron potential (mV) when multiple ions with different permeabilities are present
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How can we determin the Resting membrane potenial?
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By modifying GHK equation to Vm=-60log(permeability ratios)
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What define the realisic FLOW across real membranes?
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Partition
Diffusion Permeation |
