BIO 203 Lecture 8

BIO 203 Lecture 8 - February 15, 2007 Lecture 8 Equilibrium...

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February 15, 2007 Lecture 8 Equilibrium potential is not equal to resting membrane potential Changes in resting membrane potentials Graded and action potentials Excitable tissue o Capable of generating or responding to, electrical signals (changes in membrane potential) Changes graded or action o Neural tissue, muscle tissue, endocrine tissue Graded potentials o Changes are slow, decrement over time o Cells are polarized, interior more negative on the inside o Depolarization occurs when the ion movement reduces the charge imbalance, get less negative, closer to 0mV or (above) o Hyperpolarization is the development of even more negative charge inside the cell, closer to –90 mV o Increasing the strength of the stimulus, increase the graded potential, larger change in charge inside the cell o If you have two stimuli at same time, you can have summation, a greater difference in charge o Graded potentials can be hyperpolarized or depolarized o They decay over distance, decrease in amplitude and come back to 0 o If u increase permeability to Na+ (open more channels), it will come into the cell and depolarize the membrane, make less –mV o Increase permeability to K+, will move out of the cell and membrane
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This note was uploaded on 04/08/2008 for the course BIO 328 taught by Professor Cabot during the Spring '07 term at SUNY Stony Brook.

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BIO 203 Lecture 8 - February 15, 2007 Lecture 8 Equilibrium...

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