31 - VertPhysNotes8/31 31/08/201021:48:00

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Vert Phys Notes 8/31 31/08/2010 21:48:00 Nerve cell  Record voltage difference across membrane o Voltage is a relative measurement 2 electrodes in the same concentration, same everything o potential = 0 o as soon as the electrode penetrates the cell, equals negative  immediately and stays at that value this is the cell’s resting potential (every cell has one) o Electrode neutrality in 2 compartments with equal concentrations  (both) No voltage difference (IF ELECTRO-NEUTRAL) o Do ions move freely? Both move by brawnian motion No net movement, random What about 2 diff concentrations? o Both diffuse down conc. Gradient towards equilibrium What about a semi-permeable membrane? (ex: only k+) o See a voltage because of charge separation o See a build up of pos. charge, contributes to neg. on other side (in the 
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31 - VertPhysNotes8/31 31/08/201021:48:00

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