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Sensorimotor Systems of the Spinal Cord

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In an elite weight lifter, name a mechanism to increase force when most or all motor units have been activated.

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A. Modulate the firing rate through summation

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B. Recruit primarily slow twitch motor units

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C. Use short muscle length

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D. Activate small motor neurons only

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A. Modulate the firing rate through summation

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Part of any purposeful movement is to adapt to the demands of the environment. How does afferent input from the muscle spindle help to produce purposeful movement?

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A. Alpha-gamma co-activation helps detect the rate of change in limb position

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B. Afferents converge to activate agonist motor neurons

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C. Afferents diverge to activate inhibitory interneurons to agonist motor neurons

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D. All of the above

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B. Afferents converge to activate agonist motor neurons

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In a patient that has sustained a partial spinal cord injury, how would inhibitory interneurons be affected?

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A. Descending drive to the inhibitory interneurons will increase

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B. Inhibitory interneurons will increase in number

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C. Excitatory interneurons will increase in number

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D. Descending drive to the inhibitory interneurons will decrease

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D. Descending drive to the inhibitory interneurons will decrease

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What organizational structures within the spinal cord can produce complex limb movements?

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A. Central pattern generators

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B. Muscle spindles

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C. Gamma motor neurons

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D. All of the above

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A. Central pattern generators

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How will treadmill training change neural systems in the lumbar cord after spinal cord injury?

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A. Alternating contraction patterns between muscles of the legs will increase

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B. Neural activation will adapt to afferent input according to the environmental context

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C. Learning and plasticity will occur

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D. All of the above

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D. All of the above

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Increased muscle tone and spasticity typically occurs after spinal cord injury. What spinal cord structures are affected and how?

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A. Direct damage and loss of alpha motor neurons which innervate the ...

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