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Unformatted text preview: 5) Basic Mechanism of Heart Cycle a) Ventricle contraction Ventricle contracts Atrium relaxes Blood will come in b) Atrium contraction Atrium contracts Blood will exit Ventricle relaxes c) SA valve opens / AV valve closes Atrium Relax Atrium and ventricles contract SA valve closes / AV valve opens-Control of Rhythm a) Pacemaker (SA node) generates the electrical signal b) Signals are delayed at AV node c) Signals reach to heart apex d) Signals spread throughout ventricles by Purkinje fibers...
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- Spring '11