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21 Cards in this Set
- Front
- Back
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What is the purpose of the intrinsic conduction system of the heart?
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It sets the basic rhythm of the heart.
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What type of cells are present in the intrinsic conduction system of the heart?
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Autorhythmic cardiac cells
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List the six areas within the heart where autorhythmic cells are found.
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SA node
Internodal pathway AV node AV bundle Bundle branches Purkinje fibers |
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Interatrial septum to the interventricular septum.
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AV bundle
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Lower interventricular septum to the myocardium of the ventricles.
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Purkinje fibers
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Inferior interatrial septum.
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AV node
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Upper right atrium
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SA node
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Throughout the walls of the atria.
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Internodal pathway
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Within the interventricular septum.
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bundle branches
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Initiates the depolarization impulse that generates an action potential, setting the overall pace of the heartbeat.
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SA node
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Convey the action potential to the contractile cells of the ventricle.
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Purkinje fibers
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Delays the action potential while the atria contract.
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AV node
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Links the SA node to the AV node, distributing the action potential to the contractile cells of the atria.
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Internodal pathway
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Electrically connects the atria and the ventricles, connecting the AV node to the Bundle Branches.
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AV bundle
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Conveys the action potential down the interventricular septum.
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Bundle branches
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Explain the difference between the electrical and mechanical events which occur within the heart, and explain the cell types that carry out each. Which occurs first, the electrical or mechanical events?
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Electrical events are act. pots. which spread from the autorhythmic cells of the intrinsic conduction systole to contractile cells. Mechanical events are a subsequent contraction of the contractile cells that cause the heart beat. The electrical happens first.
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In an ECG tracing, how are the following represented:
a. atrial depolarization. b. atrial repolarization c. ventricular depolarization d. ventricular repolarization. |
a. Pwave
b. QRS complex c. QRS complex d. T wave |
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Why is it important for the contraction of the ventricle to begin at the apex and move superiorly?
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Because it forces the blood up toward the arteries.
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The P wave indicates the electrical event of atrial depolarization. What mechanical event follows the P wave?
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Atrial contraction
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The QRS complex indicates the electrical event of ventricular depolarization. What mechanical event follows the QRS complex?
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Ventricular contraction
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The T wave indicates the electrical event of ventricular repolarization. What mechanical event follows the T wave ?
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ventricular relaxation
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