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An interaction effect refers to the case where the nature or strength of the relationship between one of the independent variables and the dependent variable differs as a function of the:
Ventricular Contraction
This refers to the phase in the cardiac cycle where the ventricles (lower chambers of the heart) contract to pump blood out to the body and lungs.
Apex
Extremity of a conical or pyramidal structure. The apex of the heart is the rounded tip directed anteriorly and slightly inferiorly.
AV Bundle
The bundle of His, which is a collection of heart muscle cells specialized for electrical conductivity that transmits the electrical impulses from the AV node to the point of the apex of the fascicular branches.
SA Node
Sinoatrial node, the heart's natural pacemaker, initiating the electrical impulses that set the rate and rhythm of your heartbeat.
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