Lecture 11 - Electrical Signals in Neurons Bio416K Spring 08

Lecture 11 - Electrical Signals in Neurons Bio416K Spring...

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If Cells Permeability to an Ion Changes, Cell’s Membrane Potential Changes = Threshold to excite cell to fire an action potential
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Trigger zone Graded potential – Point of origin Graded Potentials Target Dendrites or Cell Body Graded potentials Action potentials
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Graded Potentials Lose Strength As They Move Through Cytoplasm Lose strength because: 1. Current leak 2. Cytoplasmic resistance
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Subthreshold and Suprathreshold Graded Potentials in Cells
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Spatial Summation of Graded Potentials
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Axon Hillock Acts as an Integration Center Cl - Na +
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Action Potentials Represent Movement of Na + and K + Across Membrane (Fig. 8-9, p. 259)
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Voltage-gated Na + Channels in the Neuron with Two Gates
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Action Potential Refractory Periods
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The Olfactory Pathway
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Transduction in Olfactory Receptors
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Action Potential of a Cardiac Contractile Cell
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Refractory Periods in Cardiac Muscle
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Stimulus Intensity is Determined by Frequency of Action Potentials
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Lecture 11 - Electrical Signals in Neurons Bio416K Spring...

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