The Membrane Potential 8-27-10(1)

The Membrane Potential 8-27-10(1) - The Membrane Potential...

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The Membrane Potential Dr. McKemy 8/27/2010
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Types of neuronal electrical signals
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Recording passive and active electrical signals in a nerve cell
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Membrane Potential The plasma membranes of excitable cells have a membrane potential . Electrical voltage difference across the membrane. Due to differences in sodium and potassium ion concentration in and out of the cell. Potassium is higher inside cell, sodium is higher outside. Inside of the cell has a higher concentration of negative phosphate ions and proteins.
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Voltage (V) Represents the potential to do work. Can be positive or negative. Volts, usually milli- (10 -3 ) volts Current (I) The flow of positively or negatively charged ions. Results in a movement of charge from one side of the membrane to another. Amps, usually micro- (10 -6 ) or nano- (10 -9 ) amps Resistance (R) Something that impedes the flow of ions. Ohms.
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The Membrane Potential 8-27-10(1) - The Membrane Potential...

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