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Sensorimotor Systems of the Spinal Cord

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

A. Modulate the firing rate through summation

B. Recruit primarily slow twitch motor units

C. Use short muscle length

D. Activate small motor neurons only

A. Modulate the firing rate through summation

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?

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

B. Afferents converge to activate agonist motor neurons

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

D. All of the above

B. Afferents converge to activate agonist motor neurons

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

A. Descending drive to the inhibitory interneurons will increase

B. Inhibitory interneurons will increase in number

C. Excitatory interneurons will increase in number

D. Descending drive to the inhibitory interneurons will decrease

D. Descending drive to the inhibitory interneurons will decrease

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

A. Central pattern generators

B. Muscle spindles

C. Gamma motor neurons

D. All of the above

A. Central pattern generators

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

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

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

C. Learning and plasticity will occur

D. All of the above

D. All of the above

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

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

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