Resting Potential - -4 Factors That Affect Action Potential...

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AP Biology Resting Potential - Key Terms * Membrane Potential = A difference in electrical charge across the cell membrane * Resting Potential = A membrane potential when the neuron doesn’t send a signal. = Approximately between -60 mV and -80 mV = Controlled by Na + / K + ion channels (selective permeability) = Negative simply means relative to the outside (it is indeed +) - The Process of Generation of Resting Potential * Potassium ions influx into the cell membrane through potassium channels * Substances tend to move from high concentration to low concentration (so does K + ) * As a result, the inside becomes negative (-) while the outside is positive (+)
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Unformatted text preview: -4 Factors That Affect Action Potential * Sodium and Potassium Ion Gated Channels * Leak of Sodium ions in * Leak of Potassium ions out * Organic Anions with Negative Charges-Equilibrium Potential = The magnitude of a cell’s membrane voltage at equilibrium * For instance, E k = -90mV and E Na = 62 mV * This means that the inside of the cell is 90mV more negative than the outside-The reality is that the resting potential is less negative because of the constant movement of Na + ions through sodium channels. -The resting potential is closer to the E k : Many open K + channels and very small open Na + channels...
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