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It Keeps On Beating Name of PowerPoint Name of Course Name of Lesson

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Presentation on theme: "It Keeps On Beating Name of PowerPoint Name of Course Name of Lesson"— Presentation transcript:

1 It Keeps On Beating Name of PowerPoint Name of Course Name of Lesson
Project Lead The Way© Copyright 2005

2 Cardiac Cycle One complete sequence of pumping and filling
Name of PowerPoint Name of Course Name of Lesson Cardiac Cycle One complete sequence of pumping and filling Contraction phase is called systole Relaxation phase is called diastole Average adult at rest completes 75 cardiac cycles per minute or 0.8 seconds per cycle Project Lead The Way© Copyright 2005

3 What Makes the Heart Beat?
Name of PowerPoint Name of Course Name of Lesson What Makes the Heart Beat? Caused by electrical impulses: SA Node (sinoatrial node) Pacemaker Sets timing and rhythm of heart beat Sends electrical impulse similar to nerve impulse Triggers cells of both atria to contract in unison Impulse travels thorough cardiac cells to AV node (atrioventricular node) Project Lead The Way© Copyright 2005

4 What Makes the Heart Beat?
Name of PowerPoint Name of Course Name of Lesson What Makes the Heart Beat? AV Node (atrioventricular node) Located in wall between right atrium and right ventricle Delays spreading the electrical impulses for 0.1 seconds to ensure the atria are completely empty Sends impulses to specialized muscle fibers and Purkinje fibers, which conduct signal to apex of heart and induce ventricular contraction Project Lead The Way© Copyright 2005

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