17 Questions
Which node generates impulses about 75 times per minute?
Sinoatrial node (SA node)
Which node delays the impulse approximately 0.1 second?
Atrioventricular node (AV node)
Which pathway carries the impulse toward the apex of the heart?
Bundle branches
Which fibers carry the impulse to the heart apex and ventricular walls?
Purkinje fibers/plexus
What is the normal heart rate range for the Sinoatrial (SA) node?
60-100bpm
What is the normal heart rate range for the Atrioventricular (AV) node?
40-60bpm
Which node takes over as the pacemaker if the SA node is damaged?
AV node
What is the function of the AV node?
Delays the signal
Which fibers carry the signal to the ventricle muscle cells?
Purkinje fibers
Which artery supplies the AV node in 80% of people?
RCA
How many smaller tracts does the left bundle divide into near its origin?
Six
What is the function of the subendocardial branches of the AV bundle?
Stimulate the walls of the ventricles
Where is the sinu-atrial (SA) node located?
Anterolaterally just deep to the epicardium at the junction of the SVC and right atrium
How many times per minute does the SA node give off an impulse in most people most of the time?
70
Which artery usually supplies the SA node?
Sinu-atrial nodal artery
Where is the atrioventricular (AV) node located?
Posteroinferior region of the interatrial septum near the opening of the coronary sinus
Which node distributes the signal to the ventricles through the AV bundle?
Atrioventricular (AV) node
Test your knowledge of the heart's conducting system and its various components, including the Sinoatrial node, Atrioventricular node, bundle branches, and Purkinje fibers. Learn about the excitation sequence and how the SA node generates impulses. Take this quiz to deepen your understanding of the heart's electrical pathways.
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