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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings C h a p t e r 20 The Heart Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
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Background Knowledge Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
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Introduction to Cardiovascular System Pulmonary Circuit vs Systemic Circuit Four Chambers of the Heart Right atrium Left atrium Right ventricleLeft ventricle
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings
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Introduction to Cardiovascular System Three Types of Blood Vessels Arteries Carry blood away from heart Veins Carry blood to heart Capillaries Networks between arteries and veins Are all arteries red? Are all veins blue?
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Figure 20–2c Anatomy of the Heart Pointed tip is apex Surrounded by protective “bag” (pericardium) Sits between two pleural cavities in the mediastinum (cavity)
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Anatomy of the Heart Figure 20–3c The Superficial Anatomy of the Heart
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Anatomy of the Heart Figure 20–3b The Superficial Anatomy of the Heart
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Anatomy of the Heart The Heart Wall Pericardium outside layer --------------- Epicardium (outer layer) Myocardium (middle layer) Endocardium (inner layer)
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Anatomy of the Heart Cardiac Muscle Tissue Intercalated discs Interconnect cardiac muscle cells (SMALL, 1 NUCLEUS) Secured by desmosomes (force of Contraction) Linked by gap junctions (pass Action Potentials)
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Anatomy of the Heart Figure 20–5 Cardiac Muscle Cells
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Anatomy of the Heart Internal Anatomy and Organization Septum: wall to separate compartments Atrioventricular (AV) valves The fibrous flaps that form bicuspid (2) and tricuspid (3) valves Permit blood flow in one direction: atria to ventricles The Heart: Valves
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Anatomy of the Heart The Right Atrium (contact with) Superior vena cava Receives from head, neck, upper limbs, and chest Inferior vena cava Receives from trunk, viscera, and lower limbs
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Anatomy of the Heart The Right Ventricle chordae tendinae attach to papillary muscles of ventricle Right atrioventricular (AV) Valve (Tricuspid)
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Anatomy of the Heart The Left Atrium Pulmonary veins deliver to left atrium Blood from left atrium passes to left ventricle through Bicuspid or left atrioventricular (AV) valve
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Anatomy of the Heart The Left Ventricle Holds same volume as right ventricle muscle is thicker and more powerful Systemic circulation Blood leaves through semilunar valve to aortic arch
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Anatomy of the Heart Figure 20–7 Structural Differences between the Left and Right Ventricles
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Anatomy of the Heart The Heart Valves Semilunar valves Pulmonary and aortic tricuspid valves Prevent backflow from pulmonary trunk and aorta into ventricles Figure 20–8 #TAVRmichigan
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings The Conducting System The Cardiac Cycle Begins with action potential at SA node To AV Node To Purkinje Fibers To Cardiac Muscle Electrocardiogram (ECG)
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings The Conducting System Figure 20–13 Impulse Conduction through the Heart
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings The Cardiac Cycle Figure 20–18 Heart Sounds Systole vs Diastole
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Cardiodynamics Hormonal Effects on Heart Rate Increase heart rate (stimulation of SA node) Epinephrine (E) Norepinephrine (NE) Thyroid hormone
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Click on Image for Animation
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Heart Conditions Heart Murmur (Stenotic) Tachycardia Myocardial Infarction (Heart Attack) Ischemic (stroke) VSD or ASD (septal defect) Cardiac Arrhythmia Hemophilia
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Copyright © 2009 Pearson Education, Inc., publishing as Pearson Benjamin Cummings Heart Conditions Heart Murmur (Stenotic) Sounds produced by regurgitation through valves, leaks Tachycardia Abnormally high heart rate Myocardial Infarction (Heart Attack) Cut off blood supply to heart Ischemic (stroke) Blood flow to brain interrupted VSD or ASD (septal defect) Patch hole within 2 years of age, if necessary. Cardiac Arrhythmia Irregular heartbeats, once a month or continuous (anxiety, alcohol, drug, medications) Hemophilia Fibrin affected by this sex linked trait, prevents proper clotting
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