PHGY 209 - Nervous system

PHGY 209 - Nervous system - a Screen clipping taken:...

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Screen clipping taken: 06/10/2010, 11:55 AM ***to know*** Screen clipping taken: 06/10/2010, 11:56 AM Ion channels are protein molecule that selectively let some ions in, other not. *** Real resting membrane potention = -70mV ACTINO POTENTIAL Screen clipping taken: 06/10/2010, 11:58 AM . Depolarization of the membrane to threshold activates a small fraction of sodium channels 10-06-10 October 6, 2010 11:54 AM Ner. Syn. Page 1
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Screen clipping taken: 06/10/2010, 11:59 AM This positive feedback mechanism results very rapidly in maximal activation of sodium channels Screen clipping taken: 06/10/2010, 11:59 AM depolarization of the membrane from the resting level to a new level, near En
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Unformatted text preview: a Screen clipping taken: 06/10/2010, 12:00 PM Inactivation terminates the sodium influx, causing the membrane to relax back to its original resting level Screen clipping taken: 06/10/2010, 12:02 PM Ner. Syn. Page 2 Screen clipping taken: 06/10/2010, 12:03 PM All action potentials are the same size, or the duration. The intensity is encoded by the frequency of the action potentials. Screen clipping taken: 06/10/2010, 12:14 PM The thicker the axon, the faster propagation • Screen clipping taken: 06/10/2010, 12:17 PM Screen clipping taken: 06/10/2010, 12:18 PM Screen clipping taken: 06/10/2010, 12:21 PM Electrotonic currents Ner. Syn. Page 3...
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This note was uploaded on 08/20/2011 for the course PHGY 209 taught by Professor Wechsler during the Fall '07 term at McGill.

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PHGY 209 - Nervous system - a Screen clipping taken:...

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