Heartbeat and Heart Contraction Coordination
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Study.comRebecca Gillaspy
Heartbeat and Heart Contraction Coordination
The heart has a regulatory system, known as the intrinsic conduction system, that determines the pace of the heartbeat. Learn about the intrinsic conduction system, including the SA node, AV node, the bundle of His, bundle branches, and Purkinje fibers, and discover its role in heart contraction coordination.
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The heart works through a repeated cycle of contraction and relaxation to pump blood. This cycle has two main phases: --- 1. Systole (Contraction Phase) The atria contract first, pushing blood into the ventricles. The ventricles contract next, pumping: Oxygenated blood from the left ventricle → body Deoxygenated blood from the right ventricle → lungs Valves (mitral, tricuspid, aortic, pulmonary) close and open in sequence to ensure blood flows in one direction. --- 2. Diastole (Relaxation Phase)
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