Neural Signals and Synapses

Neural Signals and Synapses - Neural Signals A. Neurons...

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Neural Signals B. Membrane Potential C. Action Potential
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Structure of Vertebrate Neurons Cell Body Dendrites Myelinated Axon Synapse Postsynaptic Neuron Axon terminals
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The Stretch Reflex + - + Knee Extensor (Quadriceps) Knee Flexor (Hamstring) TAP Sensory neuron Extensor motor neuron Flexor motor neuron Inhibitory interneuron
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Signals in the Nervous System Signals are brief changes in the electrical potential difference across the plasma membrane of neurons. Postsynaptic potentials are graded, local signals 5 ms 20 mV Action potentials are all-or- none signals that propagate long distances regeneratively stimulus - 90 + 40 0 V m (mV) 0
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Ionic Basis of the Membrane Potential (V m ) 5 mM KCl 150 mM KCl Outside Inside Cl- K + + - Na+ K+ K + (chemical) (electrical) At equilibrium, the outward (concentration-driven) flux of K+ is equal (and opposite) to the inward (electrically driven) flux of K+.
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INTRACELLULAR (-70 mV) Na+ channel K+ channel Cl- channel
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This note was uploaded on 04/21/2009 for the course BISC 220L taught by Professor Herrera,mcclure during the Spring '07 term at USC.

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Neural Signals and Synapses - Neural Signals A. Neurons...

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