Physiology Quiz - Cardiac Conduction

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CardioECI517
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  • 1/6 Questions

     The initial phase of the action potential, associated with the rapid opening of sodium channels is called:

    • Plateau
    • Initiation
    • Depolarization
    • Repolarization
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About This Quiz

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

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  • 2. 

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

    • Depolarization

    • Tetanus

    • Refractory

    • Autorhythmic

    Correct Answer
    A. Refractory
    Explanation
    During the refractory period, the muscle is unable to generate another contraction. This period occurs immediately after a contraction and is necessary for the muscle to reset and regain its sensitivity to stimuli. This prevents the muscle from contracting again before it has fully relaxed and allows for proper muscle function and coordination.

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  • 3. 

    The normal path of impulse conduction in the heart is: 

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

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

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

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

    Correct Answer
    A. SA node - AV node - AV bundle - bundle branches - Purkinje fibers
    Explanation
    The correct answer is SA node - AV node - AV bundle - bundle branches - Purkinje fibers. This is the normal sequence of impulse conduction in the heart. The SA node (sinoatrial node) initiates the electrical impulse, which then travels to the AV node (atrioventricular node). From the AV node, the impulse is conducted through the AV bundle (bundle of His) and then into the bundle branches. Finally, the impulse spreads through the Purkinje fibers, causing the contraction of the ventricles.

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  • 4. 

     All of the following are true about repolarization, EXCEPT:  

    • Membrane potential returns to resting potential (-90 mV)

    • Is associated with potassium outflow

    • Occurs before the plateau phase of the action potential

    Correct Answer
    A. Occurs before the plateau phase of the action potential
    Explanation
    During repolarization, the membrane potential returns to its resting potential (-90 mV) and is associated with potassium outflow. However, it does not occur before the plateau phase of the action potential.

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  • 5. 

    The long refractory period characteristic of cardiac muscle contributes to all of the following EXCEPT:

    • Tetanus (sustained muscle contraction)

    • Allows cardiac muscle to relax before contracting again

    • Allows ventricles to fill with blood during relaxation

    • Promotes effective blood flow to the body

    Correct Answer
    A. Tetanus (sustained muscle contraction)
    Explanation
    The long refractory period characteristic of cardiac muscle prevents tetanus (sustained muscle contraction) from occurring. This is because during the refractory period, the cardiac muscle is unable to respond to another stimulus and therefore cannot sustain a contraction. Instead, it allows the cardiac muscle to relax before contracting again, which is important for proper functioning of the heart. Additionally, the refractory period allows the ventricles to fill with blood during relaxation, promoting effective blood flow to the body.

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  • 6. 

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

    • Potassium

    • Sodium

    • Chloride

    • Calcium

    Correct Answer
    A. Calcium
    Explanation
    Calcium is required for muscle contraction. When the concentration of calcium rises inside the contractile fiber, it triggers the release of calcium from the sarcoplasmic reticulum, which then binds to troponin and initiates the sliding of actin and myosin filaments, resulting in muscle contraction. Potassium, sodium, and chloride ions are involved in maintaining the resting membrane potential and action potential in muscle cells, but they do not directly trigger muscle contraction.

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  • Current Version
  • Mar 21, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Sep 11, 2011
    Quiz Created by
    CardioECI517
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