Lecture 6 - Neurons - Graded potentials Action potentials...

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Homeostasis
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Negative Feedback
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Homeostatic control mechanism Receptor Control center Effector
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Neurons Functional Units of the Nervous System
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The Nervous System
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Cells of the Nervous System Neuroglial cells Neurons
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Neuroglial Cells
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Neurons Functional units of the nervous system Three general types of neurons Neuron structure
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Sensory Neurons Afferent neurons
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Interneurons Association neurons
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Motor Neurons Efferent neurons
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Neuron Structure Cell body Dendrites Axon
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Myelin Sheath
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Nerves Three types of nerves
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Neuron Signaling Neurons propagate electrical signals
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Membrane Potential
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Resting Membrane Potential
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Electrical Signaling Two types of electrical signal
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Unformatted text preview: Graded potentials Action potentials Graded Potential recorded potential (millivolts) 80 40 40 80 action potential threshold resting potential EPSP IPSP 2 1 3 time (milliseconds) Action Potential Action Potential: Depolarization Rising phase Action Potential: Repolarization Falling phase Conduction of Action Potential action potential Na + (axon) (extracellular fluid) + + action potential Na + (axon) (extracellular fluid) K + + + Neurons communicate with other cells at synapses Synapse Synaptic Transmission Neurotransmitters Synaptic Transmission...
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This note was uploaded on 04/22/2009 for the course BIO 309D taught by Professor Jessicawandelt during the Spring '08 term at University of Texas at Austin.

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Lecture 6 - Neurons - Graded potentials Action potentials...

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