BIOS41_Lecture14_02182008

BIOS41_Lecture14_02182008 - 12_38_act_potential_propg_part2...

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BIOS 41 Biology Core I: Cellular and Molecular Spring 2008 Professor J. A. Sands Lecture 14, February 18 Membrane Transport (Chapter 12, pages 403-423) Ion Channel Proteins
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12_24_Gated _ion_chan .jpg Gated ion channels respond to different types of stimuli.
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12_28_K_leak_chan.jpg Potasium ion leak channels in plasma membrane play major role in generation of membrane potential.
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12_30_neuron .jpg A typical neuron has a cell body, a single axon, and multiple dendrites.
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12_34_Ion_flows.jpg Ion flows dictate the rise and fall of an action potential.
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12_38_act_potential_propg_part1 .jpg An action potential can be propagated along the length of an axon.
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Unformatted text preview: 12_38_act_potential_propg_part2 .jpg 12_40_nerve_terminal.jpg An electrical signal is converted into a chemical signal at a nerve terminal. 12_41_ion_channel_synp.jpg A chemical signal is converted into an electrical signal by transmitter-gated ion channels at a synapse. 12_44_motor_neuron.jpg Ion channels, therefore, are at the heart of the machinery that enables you to act, think, feel, speak, and remember. (page 421) Thousands of synapses form on the cell body and dendrites of a motor neuron in the spinal cord....
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BIOS41_Lecture14_02182008 - 12_38_act_potential_propg_part2...

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