Physiology MCQ Quiz

211 Questions | Total Attempts: 56

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Physiology Quizzes & Trivia

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Questions and Answers
  • 1. 
    Compound action potentials can be graded responses.
    • A. 

      True

    • B. 

      False

  • 2. 
    The sciatic nerve contains axons of both afferent and efferent neurones.
    • A. 

      True

    • B. 

      False

  • 3. 
    The absolute refractory period of an action potential is the period after an initial stimulus when it is impossible to evoke another action potential with a second stimulus.
    • A. 

      True

    • B. 

      False

  • 4. 
    The stimulus voltage required to give the maximal CAP amplitude represents the firing threshold of the most excitable axons in the nerve.
    • A. 

      True

    • B. 

      False

  • 5. 
    The refractory periods of individual axons are important as they dictate the maximal action potential firing rate of a neuron.
    • A. 

      True

    • B. 

      False

  • 6. 
    Action potential amplitude is proportional to the strength of the stimulus.
    • A. 

      True

    • B. 

      False

  • 7. 
    Compound action potentials represent the algebraic sum of several individual action potentials being evoked at approximately the same time in a compound nerve.    
    • A. 

      True

    • B. 

      False

  • 8. 
    Upon reaching threshold, action potentials in single nerve fibres can be graded responses. 
    • A. 

      True

    • B. 

      False

  • 9. 
    The excitability threshold of an axon is proportional to its length.    
    • A. 

      True

    • B. 

      False

  • 10. 
    Intracellular electrical recording is often used as a tool for diagnosing problems with nerve conduction such as carpal tunnel syndrome.
    • A. 

      True

    • B. 

      False

  • 11. 
    When applying an artificial electrical stimulus action potentials are initiated at the positive stimulating electrode.
    • A. 

      True

    • B. 

      False

  • 12. 
    The time taken for an evoked compound action potential to reach a recording electrode is known as the CAP threshold.
    • A. 

      True

    • B. 

      False

  • 13. 
    The sciatic nerve is the shortest mixed nerve in the frog.    
    • A. 

      True

    • B. 

      False

  • 14. 
    Within any given type of nerve fibre (myelinated or unmyelinated), conduction velocity is faster in large diameter fibres than in small diameter fibres.
    • A. 

      True

    • B. 

      False

  • 15. 
    Conduction velocity in an axon is proportional to the strength of the stimulus.
    • A. 

      True

    • B. 

      False

  • 16. 
    When recording a compound action potential from a nerve the threshold stimulus voltage represents the voltage at which the most excitable axons reach firing threshold.
    • A. 

      True

    • B. 

      False

  • 17. 
    While recording a compound action potential using bipolar recording electrodes, the waveform of an evoked compound action potential can be converted from a biphasic to monophasic shape by tightly ligating the stimulated nerve after the most distal recording electrode.
    • A. 

      True

    • B. 

      False

  • 18. 
    Compound action potentials are naturally occurring phenomena.
    • A. 

      True

    • B. 

      False

  • 19. 
    In vivo, action potentials usually propagate bidirectionally.
    • A. 

      True

    • B. 

      False

  • 20. 
    The relative refractory period roughly coincides with the period of action potential after hyperpolarisation.   
    • A. 

      True

    • B. 

      False

  • 21. 
    Intracellular fluid is sub extracellular fluid.
    • A. 

      True

    • B. 

      False

  • 22. 
    Recruitment of motor units decreases the strength of contraction of skeletal muscle.
    • A. 

      True

    • B. 

      False

  • 23. 
    The neuromuscular junction (NMJ) is a synapse.    
    • A. 

      True

    • B. 

      False

  • 24. 
    The action potential in skeletal muscle travels through the muscle via T-tubules    
    • A. 

      True

    • B. 

      False

  • 25. 
    The arrival of an action potential at the neuromuscular junction (NMJ) causes the release of noradrenaline.
    • A. 

      True

    • B. 

      False