PSY_3_1_12_2010_1 - Define temporal and spatial summation...

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1/12/10 Lecture 3 Objectives • Define an ion and an ion channel • Define membrane potential and describe the distribution of ions across the axon membrane that contributes to the resting membrane potential • Identify and describe the 4 factors contributing to the establishment of the resting membrane potential. • Explain how each of the factors contributes to the distribution of Na+, K+ and Clacross the membrane at rest • Compare and contrast depolarization and hyperpolarization in terms of the membrane potential • Define a postsynaptic potential, distinguish between EPSPs and IPSPs, and explain whey they are graded responses • Define the threshold for activation and explain what happens in the neuron when the threshold is reached
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Unformatted text preview: Define temporal and spatial summation and understand how they can influence the likelihood that a neuron will fire an action potential Explain how the movement of ions contributes to the generation and propagation of the action potential Explain why action potentials usually only travel in one direction Lecture 3 Objectives Explain the ionic basis for the refractory period. Compare absolute versus relative refractory period in terms of the likelihood a neuron will fire Describe what is meant by the action potential being All-or-None and being nondecrimental in its propagation Describe the 2 factors contributing to the velocity of the action potential...
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PSY_3_1_12_2010_1 - Define temporal and spatial summation...

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