Neurons - Table 4.1 comparison Action Potentials Two types...

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1 Getting cells excited! Neurons and the impulses they send and receive. Neuron Networks • Afferent neurons • Efferent neurons • Interneurons
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2 CNS and PNS • Central nervous system (CNS) – Consists of brain and spinal cord • Peripheral nervous system (PNS) – Afferent division Glial Cells
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3 Functional Units
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4 Important ion concentrations to be familiar with for now
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5 Action Potential • Brief, rapid, large (100mV) changes in membrane potential during which potential actually reverses • Involves only a small portion of the total excitable cell membrane • Do not decrease in strength as they travel from their site of initiation throughout remainder of cell membrane
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6 Action Potentials • When membrane reaches threshold potential Action Potentials
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7 Action Potentials
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Unformatted text preview: Table 4.1 comparison Action Potentials Two types of propagation Contiguous conduction Saltatory conduction 8 Contiguous Conduction Similar to a graded potential, but is unidirectional New action potential in adj. area, self-perpetuating cycle Saltatory Conduction Voltage gated sodium ion channels Increased fiber diameter, decreased resistance 9 Saltatory Conduction Propagates action potential faster than contiguous conduction because action potential does not have to be regenerated at myelinated section Myelinated fibers conduct impulses about 50 times faster than unmyelinated fibers of comparable size Myelin Why does it travel so fast? 10 11...
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This note was uploaded on 04/26/2009 for the course LIFESCI 2 taught by Professor Pires during the Winter '08 term at UCLA.

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Neurons - Table 4.1 comparison Action Potentials Two types...

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