Anatomy Quiz - Cardiac Conduction

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CardioECI517
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  • 1/5 Questions

     What structure serves as the pacemaker in the heart? 

    • AV node
    • Bundle of His
    • SA node
    • Purkinje fibers
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About This Quiz

Students are ready to proceed to Unit #2 once they have achieved a score of at least an 80% on the Anatomy quiz.

Anatomy Quiz - Cardiac Conduction - Quiz

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  • 2. 

     The SA node is located: 

    • In the lower left ventricle wall

    • In the septum between the atria and ventricles

    • In the septum between the left and right ventricles

    • In the upper right atrial wall

    Correct Answer
    A. In the upper right atrial wall
    Explanation
    The SA node, also known as the sinoatrial node, is located in the upper right atrial wall. This is where the electrical impulses that regulate the heart's rhythm originate. The SA node acts as the natural pacemaker of the heart, sending out regular electrical signals that cause the atria to contract and initiate the heartbeat. From the SA node, the electrical signals travel through the atria and then to the ventricles, causing them to contract and pump blood throughout the body.

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  • 3. 

    At rest, a new impulse is generated by the pacemaker at the rate of about ___ per minute:

    • 170

    • 75

    • 25

    • 125

    Correct Answer
    A. 75
    Explanation
    The correct answer is 75. This means that at rest, the pacemaker generates a new impulse approximately 75 times per minute. This indicates the normal resting heart rate, which is typically between 60 and 100 beats per minute.

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  • 4. 

    The main function of the cardiac conduction pathway is:

    • To ensure coordinated muscle contraction in the chambers and effective pumping of blood

    • To increase and decrease the heart rate in response to exercise

    • To ensure that the heart muscle in the atria and ventricles all contracts at the same time

    • None of the above

    Correct Answer
    A. To ensure coordinated muscle contraction in the chambers and effective pumping of blood
    Explanation
    The main function of the cardiac conduction pathway is to ensure coordinated muscle contraction in the chambers and effective pumping of blood. This pathway consists of specialized cells that generate and conduct electrical impulses, allowing the heart to beat in a synchronized manner. These impulses are responsible for initiating and coordinating the contraction of the atria and ventricles, ensuring that blood is efficiently pumped throughout the body. By ensuring coordinated muscle contraction, the cardiac conduction pathway helps maintain proper blood flow and overall cardiac function.

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  • 5. 

    The fibers that conduct the impulse to the ventricles are known as the:

    • SA node

    • AV bundle

    • Right bundle branch

    • Purkinje fibers

    Correct Answer
    A. AV bundle
    Explanation
    The fibers that conduct the impulse to the ventricles are known as the AV bundle. The AV bundle, also known as the atrioventricular bundle or bundle of His, is a collection of specialized muscle fibers located in the heart. It is responsible for transmitting electrical signals from the atria to the ventricles, allowing for coordinated contraction and efficient pumping of blood. The AV bundle is an essential component of the heart's electrical conduction system.

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  • Current Version
  • Mar 22, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Sep 11, 2011
    Quiz Created by
    CardioECI517
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