Conduction
                About the size of a human fist.
What is the human heart.
Tracks the atrial impulse from the SA node through the AV node, bundle of His, and bundle Branches.
What is PR interval
Main function is to delay impulses by 0.04 seconds to keep the ventricles from contraction too quickly.
What is the AV node
Measured vertically on a telemetry or 12 lead ECG
What is voltage/amplitude?
Indicates recovery period of Purkinje fibers
What is the U wave?