Lecture%204 - Lecture 4 10/5/04 Outline: Membrane...

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Lecture 4 10/5/04 Outline: Membrane Potentials, Graded Potentials, Action Potentials: Generation and Conduction, Synaptic Transmission: pre-synaptic events, post-synaptic events, neurotransmitters Graded Potentials -causes a local response within the cell that occurs at and near the site of the stimulus; not propagated Action Potential -sent over long distances, propagated , sent quickly; means by which a strong enough stimulus is conducted down the axon->axon terminal->release of neurotransmitters Membranes have many channels -can be used to generate electrical potentials -there are selective ion channels i.e. they only select for one specific molecule, such as Na+ selective channels only let Na+ through 1) leak channels-always open, mainly K+ selective (cell has a higher permeability to K+ than to anything else, at rest) - since K+ is the most permeable, it creates a negative membrane potential = polarized (*Dr. Fortes showed a diagram of the Na+, K+ movement in and out of the cell) -Hyperpolarization -increased negative charge inside the cell from taking out positive charge or adding negative charge -Depolarization- decrease the negative charge of the cell (make it more positive) -in general: any membrane potential is caused by ion diffusion driven by the respective
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This note was uploaded on 04/02/2008 for the course BILD 26 taught by Professor Aaa during the Fall '06 term at UCSD.

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Lecture%204 - Lecture 4 10/5/04 Outline: Membrane...

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