Lec13 - Neurobiology III

Lec13 - Neurobiology III - Lecture 13 Nervous System III...

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Unformatted text preview: Lecture 13 Nervous System III Reading: Chapter 4, pp. 153 - 160 Lecture Outline Action Potential Propagation of action potential along axon Saltatory conduction How does information move down the axon? Propagation of Action Potential What is an Action Potential? The Action Potential: A small stimulus generates a small depolarization that is restored quickly. A large stimulus can bring the membrane potential to its threshold potential. This triggers an Action potential (AP). If depolarization -55mV a threshold potential is achieved. AP +40mV Change in membrane permeability leads to Action Potential. Step 1 - Resting State: In the resting state voltage-gated channels are closed. Step 2 - Threshold: In response to a stimulus voltage-gated Na + channels open rapidly leading to depolarization threshold potential leading to AP. Step 3- Depolarization phase of the action potential.phase of the action potential....
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Lec13 - Neurobiology III - Lecture 13 Nervous System III...

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