Co-ordination of the Cardiac Cycle

Co-ordination of the Cardiac Cycle - Co-ordination of the...

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Unformatted text preview: Co-ordination of the Cardiac CycleAims•Describe how heart action is coordinated with reference to the sinoatrial node(SAN), the atrioventricular node(AVN) and the Purkynetissue•Be able to interpret and explain electrocardiogram(ECG) traces, with reference to normaland abnormal heart activityNovember 23, 2011•The heart is made of cardiac muscle.•When the cells receive an electricalimpulsethey contract - causing a heartbeat.•Cardiac muscle is myogenic- it can contract on its own, without needing nerveimpulses.Sinoatrial node (SA node)•This specialized node is found on the upperinside wallof the right atrium.•The SA node is known as the pacemakerof the heart and initiates a heartbeat every 0.85 seconds. •This signal travels across the atriacausing them to contract and load the ventricles with blood. •Ventricles are electrically insulated from atria - so they don’t contract yet.Atrio-ventricular node (AV node)•The AV nodeis located on the bottomsurface of the right atria...
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This note was uploaded on 11/23/2011 for the course BIO 100 taught by Professor Robinson during the Fall '08 term at BYU.

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Co-ordination of the Cardiac Cycle - Co-ordination of the...

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