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Electrical activity of the heart is first generated by the ______________________ (pacemaker cell)
Sinoatrial node
Electrical activity from this node spreads across the right and left atria along the __________________________________, causing the atria to contract simultaneously
Interartial pathway
Electrical activity from the ___________________ has
a small time delay of 0.1 seconds before it hits the
________________________
SA Node; AV node (internodal pathway)
The electrical activity travels to the ___________________, which then spreads into right and left _____________________________
Bundle of His; Bundle branches (Purkinje fibers)
The ______________________ innervate the
ventricular muscle to contract simultaneously.
Purkinje Fibers