Motor Control: Spinal Reflexes and Lower Motor Neurons

• Q1.which of the following is true regarding nuclear bag fibres of motorunit ?

  • Aresponds to length only
  • Bresponds to both length and velocity changes
  • Cresponds to contraction of muscle fibres
  • Dresponds to reflex relaxation
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• Q2.Which type of sensory receptor provides information about the force of muscle contraction

  • ANuclear bag fiber
  • BNuclear chain fiber
  • CGolgi tendon organ
  • DBare nerve ending
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• Q3.Function of Golgi tendon organ is to detect:-

  • ATension
  • BLength
  • CPressure
  • DProprioception
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• Q4.Fast fatigable motor unit recruited

  • AFirst
  • BLast
  • CDuring active phase of contraction
  • DDuring relaxation
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• Q5.The cyclical flexion and extension motions of a leg during walking result from activity at which level of the nervous system?

  • ACerebral cortex
  • BCerebellum
  • CGlobus pallidus
  • DSpinal cord
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• Q6.Inverse stretch reflex is mediated :

  • AGolgi tendon
  • BMuscle spindle
  • CUnmyelinated C fibres
  • DDorsal Column
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• Q7.Nuclear bag fiber detects

  • ASense dynamic length of muscle
  • BInvolved in reciprocal innervations
  • CAlpha motor neuron stimulation
  • DSenses muscle tension
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• Q8.Which of the following receptors mediate stretch reflex:

  • AGolgi tendon organ
  • BMerkel's disc
  • CMuscle spindle
  • DMeissner's corpuscles
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• Q9.The average no of muscle fibres attached to one golgi tendon organ are

  • A1-3
  • B5-10
  • C10-15
  • D15-75
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• Q10.contractile part of intrafusal fibres

  • ACentre
  • BEnds
  • CBoth
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Answer key

Q1: B. responds to both length and velocity changes; Q2: C. Golgi tendon organ; Q3: A. Tension; Q4: B. Last; Q5: D. Spinal cord; Q6: A. Golgi tendon; Q7: A. Sense dynamic length of muscle; Q8: C. Muscle spindle; Q9: C. 10-15; Q10: B. Ends.

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