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2Electrical+Signals

2Electrical+Signals - Announcement I will not be having...

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8/30/10 1 Announcement • I will not be having office hours on the following Fridays – Sep 3, Sep 17 and Nov 12 • I will post an announcement on TRACS Electrical Signals of Nerve Cells Electrical Transmission • Neurons are poor conductors – Axons as wires • Electrical signaling in neurons is based on potential differences across the membrane • The question is “How can potential differences across membranes be used to signal over long distances?”
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8/30/10 2 +++++++++++++++ - - - - - - - - - - - - - - - Membrane Potential (V m ) • What is V m ? • How is it measured? Changes in V m • Passive changes and action potentials • Natural or Experimental
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3 Resting Membrane Potential • Underlying principles – Concentration differences in ions due to action of ion pumps – Differential permeability of membrane due to ion channels Free Energy • The change in free energy associated with ion movement has two components – One associated with moving in a concentration gradient – One associated with moving in a charge gradient
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2Electrical+Signals - Announcement I will not be having...

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