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21 Cards in this Set

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What is the purpose of the intrinsic conduction system of the heart?
It sets the basic rhythm of the heart.
What type of cells are present in the intrinsic conduction system of the heart?
Autorhythmic cardiac cells
List the six areas within the heart where autorhythmic cells are found.
SA node
Internodal pathway
AV node
AV bundle
Bundle branches
Purkinje fibers
Interatrial septum to the interventricular septum.
AV bundle
Lower interventricular septum to the myocardium of the ventricles.
Purkinje fibers
Inferior interatrial septum.
AV node
Upper right atrium
SA node
Throughout the walls of the atria.
Internodal pathway
Within the interventricular septum.
bundle branches
Initiates the depolarization impulse that generates an action potential, setting the overall pace of the heartbeat.
SA node
Convey the action potential to the contractile cells of the ventricle.
Purkinje fibers
Delays the action potential while the atria contract.
AV node
Links the SA node to the AV node, distributing the action potential to the contractile cells of the atria.
Internodal pathway
Electrically connects the atria and the ventricles, connecting the AV node to the Bundle Branches.
AV bundle
Conveys the action potential down the interventricular septum.
Bundle branches
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?
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.
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
Why is it important for the contraction of the ventricle to begin at the apex and move superiorly?
Because it forces the blood up toward the arteries.
The P wave indicates the electrical event of atrial depolarization. What mechanical event follows the P wave?
Atrial contraction
The QRS complex indicates the electrical event of ventricular depolarization. What mechanical event follows the QRS complex?
Ventricular contraction
The T wave indicates the electrical event of ventricular repolarization. What mechanical event follows the T wave ?
ventricular relaxation