BIOM 2000 Lecture Notes - Lecture 4: Axon Terminal, Membrane Potential, Myelin
27 Sep 2017
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Document Summary
Dendrites: docking site of synapses of other neurons. Synapses: at the end of the axon, containing the neurotransmitter used to activate other cells. Multipolar neurons: many extensions from the cell body. Unipolar neurons: short single process leaving cell body. ***uni/bi/multi is indicative of how many processes it can receive*** In all cases, nerve impulses move from dendrites towards synapses. Myelin sheath: insulates the axons, formed by schwann cells. forms. Ap arriving at synapses cause controlled release of neurotransmitters. Neurotransmitters released into space between synapse and cell to be stimulated. Neurotransmitter activates receptor proteins in membrane to be stimulated. Ion channels open: activates receptors with nts, causing channels to open. na+ ions flood into cell causing depolarization of cell membrane. Ion channel closes: nts are immediately broken down and na+ channel closes. Frequency of ap arriving at synapse determines the amount of nts released from synapse. this determines.
