PSYB64H3 Chapter Notes - Chapter 3b: Axon Hillock, Saltatory Conduction, Electrical Synapse
Document Summary
Node of ranvier, down the length of a myelinated axon. Chapter 3: continuation for lecture 4. Ion channels are only located @ nodes of ranvier. Occurs via passive conduction. When an ap signal propagates the signal reaching the end of the axon is as. Recall: @ axon hillock influx of na when ap is generated. Some of the ap, are removed by na/k pump, while others remain in the axon. Ap conducted @ a rate of 5 m/s. The density of channels at a node of ranvier in a myelinated axon is about 10. Occurs via saltatory conduction movement of an ap from node of ranvier to. Ap conducted @ a rate of 120 m/s (24 x faster) Human brain contains ~ 100 billion neurons; avg neuron forms ~ 1000 synapses. Ion channels are only located @ nodes of ranvier two types of synapses: chemical synapses and electrical synapses.
