continous sensory feedback to the CNS gives info about...
muscle length, tension, and the speed of change of both length and tension
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2 types of receptors which provide the previous info
1. Muscle spindles 2. Golgi tendon organs
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muscle spindles
stretch receptors, detect LENGTH, and the rate of change of LENGTH
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Golgi tendon organs GTO
also stretch receptors, detect TENSION, and rate of change of TENSION
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these receptors send info for ...
muscle movement only
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how many synapses involved in stretch reflex
1 synapse , per branch (2 branches it could take)
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muscle fibres are either
extrafusal or intrafusal
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extrafusal
your standard muscle fibres
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intrafusal
muscle fibre has sensory neurone wrapped around it
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Branching 1 (stretch reflex)
synapse at a motor neurone - signals back to orginal muscle - causses this muscle to contract- (the agonist)
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branching 2 (stretch reflex)
synapse at inhibitray interneruone which then synapses with the a motor neurone of the antagonist muscle - this is a ihib synapse so inhib NT released - causing antagonist to relax
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intrafusal and extrafusal run parallel to each other
TRUE
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GTO reflex
protective spinal relfex, - stimulus = tension/contraction of muscle , response- RELAXATION of that muscle
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