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Unformatted text preview: d. The Equilibrium potential values for Na and K are: i. Na=+50mV ii. K= -80 mV e. The charge of the ion doesn’t matter when calculating the Eq. Potential. What does matter is the direction of the substance. f. Q: Why does K (potassium) have a negative E.P. is it’s a positive ion just like Na? g. A: Since there is more K+ inside the cell, it will want to go OUT! As it leaves, there will be a DEFICIT of this ion inside the cell and thus become negative negative EP. 3. Membrane Potential (MP) a. Refers to: electric potential of the cell’s interior relative to the exterior (which is assigned 0). b. Resting potential: -70mV i. De polarization: away from the resting potential (usually towards the positive end) ii. Re polarization: back to the resting potential iii. Hyper polarization: a bit “under” the resting potential Miguel Alvarez LS2 PLF Winter 10 Week 8 c. MP depends on the relative permeabilities of the membrane....
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- Spring '08
- Sodium, Ion, Membrane Potentials