BIO 365R Notes 031808 - 03/18/08 Seay 4.204 (T TH 11 to 12)...

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03/18/08 Seay 4.204 (T TH – 11 to 12) Stretch reflex - simple circuit - has major components of other more complicated circuits - purpose: maintain tone in muscles (quadracep & bicep) to compensate for various changes to the environment (unexpected happenings), ensures muscles are at appropriate tone & length; maintain muscle at fixed length under variable environment - key players: o sensory fiber – muscle spindles in muscles, special types of receptors (mechanical, sensitive to change in length) – convert mechanical change to electrical signal o cell bodies of sensory fiber – send axon into spinal cord o dendrites of motor neurons – receives signal o motor neuron axon – back to spindle, causes muscle to contract; postsynaptic o contraction of muscle – brings muscle back to original desired length - peripheral nervous system (PNS) – outside of spinal cord, - central nervous system (CNS) – spinal cord - afferent – from periphery to center nervous system - efferent – from center to periphery nervous system - divergent connections – sensory fiber enters spinal cord (dorsal portion) bifurcates and diverges and connects to many motor neurons; purpose:
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This note was uploaded on 04/10/2008 for the course BIO 365R taught by Professor Draper during the Spring '08 term at University of Texas at Austin.

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BIO 365R Notes 031808 - 03/18/08 Seay 4.204 (T TH 11 to 12)...

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