This is a recording of the electrical changes that occur in the myocardium during a cardiac cycle
An electrocardiogram
This wave is produced when atrial fibers depolarize
P-wave
this wave is produced when ventricular fibers depolarize.
QRS-wave
This wave is produced when the ventricular fibers repolarize
T-wave
This wave is shows the delay in the AV node
PR interval
What is the EFFCT of the P wave
Atrial contraction
What is the EFFECT of the QRS complex
Ventricular contraction
What is the EFFECT of the T wave
Ventricular relaxation
What are the two functions of the AV node
relay
delay
This is responsible for coordinating events of the cardiac cycle
The cardiac conduction system
this structure is located in the wall of the right atrium and initiates one impulse after another and is called the pacemaker because it generates the heart's rhythmic contractions
The S-A node
How does the cardiac impulse travel from the S-A node into the atrial syncytium
it goes from cell to cell via gap junctions.
Conducting fibers deliver impulses from the S-A node to the ?
AV node
This structure is located in the inferior part of the interatrial septum and provides the only normal conduction pathway between the atrial and ventricular syncytiums
The A-V node
Why are the impulses are delayed as they move through the A-V node
this allows time for atria to finish contracting
From the A-V node, impulses pass to the ?
Bundle of HIS
The A-V bundle (Bundle of HIS) is located in the superior part of the interventricular septum and gives rise to? .
left and right bundle branches
This structure carres impulses to distant regions of the ventricular myocardium?
--Purkinje fibers
This structure is located in the inferior portion of the interventricular septum, papillary muscles, and in the ventricular walls?