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PSY_3_1_12_2010_1 - • Define temporal and spatial...

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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...

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