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

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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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