Heartbeat regulation.

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Presentation transcript:

Heartbeat regulation

Heartbeat - SA Node Sinoatrial node (SA) = Pacemaker Small group of cardiac muscle cells Starts the wave of heart muscle contraction “Sets the pace”

Heartbeat - AV Node Atrioventricular node (AV) Bundle of fibers Picks up impulses from the SA node and transmits to network of fibers in the ventricles

Regulation of the Heartbeat YouTube Video Regulation of the Heartbeat

Disorders of the Circulatory System

Disorders of the Circulatory System - Atherosclerosis Fatty deposits in walls of arteries Obstruct blood flow and raise blood pressure Increase risk of blood clots

Disorders of the Circulatory System - Heart Attack Caused by blocked arteries Blood cannot get to the heart muscle Heart muscle begins to die due to lack of O2

Disorders of the Circulatory System - Stroke Blood clot breaks free and blocks a vessel leading to the brain Brain cells starved of O2 and nutrients May cause paralysis, loss of ability to speak or death

Disorders of the Circulatory System - High Blood Pressure Blood pressure is the measure of force exerted by the blood on the wall of the arteries Too much pressure can cause health problems such as heart disease

STOP HERE!

Heartbeat Heartbeat depends on body’s need for oxygen-rich blood Increase heart beat: Sympathetic nervous system Decrease heart beat: Parasympathetic nervous system

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