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Unformatted text preview: The Cardiac Cycle Describes the series of events seen during a single heartbeat. It can be divided into two major segments: diastole and systole. 1. Steps of Cardiac Cycle: (occurs 72 times a second) 1. Ventricular Filling-B1-C1-involves filling ventricles 70-80% of their capacity-represented by a P wave on an ECG a. Diastole-occurs mid to late, which is ventricular relaxation b. States of Valves-both AV valves are open-SL valves closed c. Pressure-atrial pressure greater than ventricular pressure-aortic and pulmonary pressures drop d. Wiggus Chart-represented between B and C for pressure-represented between B and C for ventricular volume 2. Atrial Contraction (systole)-C1-D1-atrial systole is signaled by P wave and then causes SA node to fire; signal from SA node causes atria to contract and blood is pushed into vertricles-this fills ventricles to their full capacity (about 20%)-since atrial systole serves as a little booster in filling the ventricles their remaining 20% it is ok if this step does not work correctly...
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This note was uploaded on 03/20/2008 for the course CBIO 2200 taught by Professor Wenzel during the Spring '08 term at University of Georgia Athens.
- Spring '08