Physiology Quiz (Reflexes -- Sleep)

30 Questions | Total Attempts: 254

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Physiology Quizzes & Trivia

Questions and Answers
  • 1. 
    The relation between intensity of the stimuli and degree of response defines which property of reflexes:
    • A. 

      Spatial summation

    • B. 

      Temporal summation

    • C. 

      Irradiation

    • D. 

      Recruitment

  • 2. 
    Interneurons play a major role in which of the following reflex properties:
    • A. 

      Reciprocal innervation

    • B. 

      Recruitment

    • C. 

      After-discharge

    • D. 

      Irradiation

    • E. 

      All of the above

    • F. 

      All of the above except D

  • 3. 
    The sucking reflex from the breast in the newly born infants is classified as a conditioned reflex.
    • A. 

      True

    • B. 

      False

  • 4. 
    When you are applied to an injurious cutaneous stimulus, the initiated reflex may show the following properties except:
    • A. 

      Irradiation

    • B. 

      Reciprocal innervation

    • C. 

      Poly-synaptic central delay

    • D. 

      After discharge

    • E. 

      None of the above

  • 5. 
    Ib fibres fire the following impulses:
    • A. 

      Sensory impulses from the nuclear chain fibres

    • B. 

      Sensory impulses from the nuclear bag fibres

    • C. 

      Sensory impulses from the muscle tendon

    • D. 

      Motor impulses to the Golgi Tendon Organ (GTO)

  • 6. 
    About the annulospiral fibres:
    • A. 

      They carry sensory innervation from the central contactile part of the nuclear bag.

    • B. 

      They carry sensory innervation from the peripheral contactile part of the nuclear bag.

    • C. 

      They carry sensory innervation from the central non-contractile part of the nuclear chain.

    • D. 

      They carry sensory innervation from the peripheral non-contractile part of the nuclear chain.

    • E. 

      None of the above.

  • 7. 
    Jendrassik maneuver is found to stimulate gamma-motor neurons in the spinal cord. This action may be explained by which reflex property: 
    • A. 

      Reciprocal innervation

    • B. 

      Irradiation

    • C. 

      After-discharge

    • D. 

      Summation

  • 8. 
    The stretch reflex shows the following property:
    • A. 

      Irradiation

    • B. 

      Synaptic fatigue

    • C. 

      After-dicharge

    • D. 

      Short latent period

  • 9. 
    The pathway of stretch reflex may contain which type of interneurons:
    • A. 

      Excitatory

    • B. 

      Inhibitory

    • C. 

      Both of 2 types

    • D. 

      No interneurons at all

  • 10. 
    About static stretch reflex. which is NOT true:
    • A. 

      The receptor is located in the nuclear chain fibres

    • B. 

      Sensory impulses are carried by flower spray Ia fibres

    • C. 

      Alpha motor neurons in the ventral horn are the center

    • D. 

      It is implemented by the conraction of the extrafusal fibres

    • E. 

      It maintains the muscle tone

  • 11. 
    The following track inhibits the activity of gamma-motor neurons:
    • A. 

      Medial reticulospinal tract

    • B. 

      Vestibulospinal tract

    • C. 

      Rubrospinal tract

    • D. 

      Lateral reticulospinal tract

  • 12. 
    All of the following are manifestations consistent with the UMNLs except:(you may choose more than one)
    • A. 

      Spastic ipsilateral paralysis

    • B. 

      Exaggaration of abdominal reflex

    • C. 

      Hypertonia

    • D. 

      Rapid dis-use atrophy

    • E. 

      +ve Babinski sign

  • 13. 
    Clasp-knife sign is observed in LMNLs
    • A. 

      True

    • B. 

      False

  • 14. 
    Clonus is a sign of UMNLs
    • A. 

      True

    • B. 

      False

  • 15. 
    Stage of spinal shock after complete cord transection is due to sudden withdrawal of inhibitory tonic discharge from the brain.
    • A. 

      True

    • B. 

      False

  • 16. 
    About Brown-Sequard syndrome, which is NOT true:
    • A. 

      Paralysis of the voluntary movement on the same side below the level of lesion.

    • B. 

      Loss of fine touch sensation on the same side below the level of lesion.

    • C. 

      Loss of pain sensation on the opposite side at the level of lesion.

    • D. 

      Hyperesthesia one segment on the same side above the level of lesion

  • 17. 
    The locus ceruleus secretes:
    • A. 

      Melatonin

    • B. 

      Serotonin

    • C. 

      Ach

    • D. 

      Noradrenaline

  • 18. 
    The parieto-occiptal cortex shows remarkably:
    • A. 

      Alpha waves

    • B. 

      Beta waves

    • C. 

      Theta waves

    • D. 

      Delta waves

  • 19. 
    Factors that increase the activity of RAS include the following except:
    • A. 

      Adrenaline

    • B. 

      Caffeine

    • C. 

      Thyroid hormone

    • D. 

      Thiopental

  • 20. 
    Caffeine is a competitive antagonist of:
    • A. 

      Orexin

    • B. 

      Melatonin

    • C. 

      GABA

    • D. 

      Adenosine

  • 21. 
    All of the following are inducers to sleep except:
    • A. 

      Galanin

    • B. 

      Melatonin

    • C. 

      Orexin

    • D. 

      Adenosine

  • 22. 
    Narcolepsy is produces by the deficiency of:
    • A. 

      Noradrenaline

    • B. 

      Serotonin

    • C. 

      Ach

    • D. 

      Histamine

    • E. 

      Orexin

  • 23. 
    According to this image, this person is extensively extending his arm and actively using his Triceps muscle. Give 2 reasons why his Biceps muscle would contract reflexly ?!
  • 24. 
    Define muscle tone and mention 4 vital functions for it.
  • 25. 
    Define Clonus.
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