7 Membrane Potential - Membrane Potential Membrane...

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Membrane Potential -1 Membrane Potential
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Membrane Potential -2 Two Types of Ion Channels • Leakage (nongated) channels always open • Gated channels open and close – voltage-gated – ligand-gated – mechanically-gated
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Membrane Potential -3 Membrane Permeability 1. Ligand-gated ion channels Na + Open Na + channel Closed Na + channel Acetylcholine bound to receptor sites Na+ diffuse through the open channel Receptor site for acetylcholine Acetylcholine ligand – molecule that binds to a receptor ion channels open in response to ligand binding
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Membrane Potential -4 Gated Ion Channels
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Membrane Potential -5 MEMBRANE POTENTIALS • Like charges repel and unlike attract • anion = negative, cation = positive • separated : move back together • creates electrical force • separation of charge = potential difference • The resting potential is what you find in a cell at …
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Membrane Potential -6 Cytoplasm Cell - - - - - - - - - - - - - + + + + + + + + + + + + Voltmeter of Science Cytoplasm Extracellular fluid -40 to -70 mV Plasma Membrane
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Membrane Potential -7 Electrical Signals in Neurons • Neurons are electrically excitable due to the resting potential • 2 types of electric signals – action potentials – local or graded potentials • In living cells, a flow of ions occurs through
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7 Membrane Potential - Membrane Potential Membrane...

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