Heartbeat regulation.

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Presentation transcript:

Heartbeat regulation

SA Node (AKA Pacemaker) Sinoatrial node (SA) Specialized bundle of myocytes Starts the wave of heart muscle contraction “Sets the pace”

AV Node Atrioventricular node (AV) Picks up impulses from the SA node and transmits the nerve impulse to a network of fibers in the ventricles

Regulation of Heartbeat Heartbeat depends on body’s need for oxygen-rich blood Increase heart beat: Sympathetic N.S. Decrease heart beat: Parasympathetic N.S.

Anatomy Animation Heartbeat YouTube Video Anatomy Animation Heartbeat

Regulation of the Heartbeat YouTube Video Regulation of the Heartbeat

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