Lec28+2011 - Lecture 28: Transmitting an action Potential...

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Reading: Chapter 48, pages 1052-1061 Self Quiz Ch 48: 2, 3, 5, 6 Lecture 28: Transmitting an action Bio 93, O’Dowd and Warrior, UCI - Copyright: All rights reserved Wednesday 11/30/11
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The generation of an action potential Bio 93, O’Dowd and Warrior, UCI - Copyright: All rights reserved Fig. 48.10
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The refractory period. Bio 93, O’Dowd and Warrior, UCI - Copyright: All rights reserved During the undershoot both the Na + channel’s activation and inactivation gates are closed. At this time the neuron cannot depolarize in response to another stimulus: refractory period .
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1. Depolarization at location #1 2. Depolarizes the neighboring region above threshold. 3. This propagates the action potential along the length of the axon Impulse conduction is unidirectional. Conduction of an action potential Bio 93, O’Dowd and Warrior, UCI - Copyright: All rights reserved Fig. 48.11
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Fig. 48.13 Saltatory conduction. In myelinated neurons only unmyelinated regions of the
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Lec28+2011 - Lecture 28: Transmitting an action Potential...

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