Physiology Quiz - Cardiac Conduction

6 Questions | Total Attempts: 1293

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Physiology Quizzes & Trivia

Students are ready to proceed to Unit #3 once they have achieved a score of at least an 80% on the Physiology quiz.


Questions and Answers
  • 1. 
     The initial phase of the action potential, associated with the rapid opening of sodium channels is called:
    • A. 

      Plateau

    • B. 

      Initiation

    • C. 

      Depolarization

    • D. 

      Repolarization

  • 2. 
     When ___ concentration rises inside the contractile fiber, contraction of the muscle occurs. 
    • A. 

      Potassium

    • B. 

      Sodium

    • C. 

      Chloride

    • D. 

      Calcium

  • 3. 
     The term that refers to the period when another contraction cannot occur in the muscle is: 
    • A. 

      Depolarization

    • B. 

      Tetanus

    • C. 

      Refractory

    • D. 

      Autorhythmic

  • 4. 
     All of the following are true about repolarization, EXCEPT:  
    • A. 

      Membrane potential returns to resting potential (-90 mV)

    • B. 

      Is associated with potassium outflow

    • C. 

      Occurs before the plateau phase of the action potential

  • 5. 
    The long refractory period characteristic of cardiac muscle contributes to all of the following EXCEPT:
    • A. 

      Tetanus (sustained muscle contraction)

    • B. 

      Allows cardiac muscle to relax before contracting again

    • C. 

      Allows ventricles to fill with blood during relaxation

    • D. 

      Promotes effective blood flow to the body

  • 6. 
    The normal path of impulse conduction in the heart is: 
    • A. 

      SA node - Purkinje fibers - AV node - AV bundle - bundle branches

    • B. 

      SA node - AV node - Purkinje fibers - AV bundle - bundle branches

    • C. 

      SA node - AV node - bundle branches - AV bundle - Purkinje fibers

    • D. 

      SA node - AV node - AV bundle - bundle branches - Purkinje fibers

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