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The AP initiated in the SA (Sino atrial) Node spreadsthroughout the myocardium.
Depolarization spreads through atria muscle cells.
*Rapid conduction allows the right and left atria to contract simultaneously.
AP spreads through the
AV (atrio ventricular) Node
AP leaves AV node and propagates down the interventricular
make contact w/ ventricular myocardial cells, impulse is spread through remainder of ventricles.
Compare & contrast the AV Node and Perkinje fibers.
-Small diameter cells.
-Small density of gap junctions
: AV delay (enables atrial contraction before ventricular excitation)
-Large diameter cells.
-Large density of gap junctions
: large diameter cells that rapidly distribute the impulse throughout ventricles.
Conducting System of Heart