apbb - Review At rest the neuron/axonal membrane is...

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Review At rest the neuron/axonal membrane is permeable to what ion? K+ At equilibrium the net flux of K+ is what? Nada What is primarily responsible for the negative charges in side the cell? Proteins
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Review What forces are acting on Na+ at rest? Electrostatic (IN) Concentration (IN) Why doesn’t Na+ enter the cell? Membrane is impermeable to Na+ at rest
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A Rapid depolarization and slight reversal of the polarization. Threshold Phases All or none Triggered at axon hillock
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Amplitude and velocity of an action potential are independent of the intensity of the stimulus Increased frequency = increased stimulus
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Threshold Triggers action potential (-40mv) Reverses membrane potential (cell becomes +) Depolarization Membrane potential closer to zero Hyperpolarization Increased membrane potential, more negative Refractory Periods Absolute No action potential regardless of stimuli Na+ channels closed Relative Stronger than usual stimulus
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Membrane Potential    mV Time msec 3 -70 +55 Threshold
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How do we generate an action potential?
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This note was uploaded on 02/24/2011 for the course PSYC 460 taught by Professor Lawrence during the Spring '10 term at South Carolina.

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apbb - Review At rest the neuron/axonal membrane is...

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