8 Neurotransmission - Neurotransmission Incoming message...

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Neurotransmission Incoming message Outgoing message
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Action Potential Propagation Unmyelinated axon AP occur at one spot on a membrane but have the ability to propagate by stimulating adjacent regions technically – AP does not “move” along an axon – one AP stimulates another AP in an adjacent location AP’s move in one direction only
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Action Potential Propagation Outside of membrane becomes more negative Inside of membrane becomes more positive Depolarization Action potential propagation Absolute refractory period Site of next action potential + – + + + + – – + + + – – + + – – – + + + + + + – – – – – – + + + + – – + + + + + – – + – – – – + + + + + + – – – – – – + + + + – + + – – + + – + + + + + + + + + + + + + + – – – – – – – – + + + + + + + + + + + + + + + + + + – – – – – movement of positive ions is called a local current
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Action Potential Propagation Myelinated axon AP conducted from one node of Ranvier to another – Saltatory Conduction local current flows between nodes of Ranvier Voltage gated Na + channels are concentrated at the nodes Flow of AP’s is much faster because of the “leaping” effect
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This note was uploaded on 12/03/2009 for the course KINESIOLOG 1Y03 taught by Professor Parises during the Spring '09 term at McMaster University.

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8 Neurotransmission - Neurotransmission Incoming message...

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