Chapter 18 Heart Spring 2011 post

Chapter 18 Heart Spring 2011 post - 1 The Cardio Vascular...

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Unformatted text preview: 1 The Cardio Vascular System: HEART Ray Thompson, PhD Summer 2009 Ray Thompson, PhD Room 317C 2 Figure 18.5 Pulmonary circuit Low pressure (2-25 mm Hg) Delivers: Oxygen-poor blood to lungs Oxygen-rich blood to Systemic Circuit Systemic circuit High Pressure (2-120 mm Hg) Delivers: Oxygen-rich blood to organs and tissues Oxygen-poor blood to Pulmonary Circuit Cardiovascular System Heart: 4 Pumps 2 Atrial 2 Ventricle 3 http://www.dkimages.com/discover/previews/740/76722.JPG 4 http://www.roshanpakistan.com/web-magzine/Health/imgs/heart2.gif Mitral Valve (Bicuspid) Aortic Valve (Semi-lunar) Tricuspid Valve (Semi-lunar) Pulmonary Valve 5 Mitral (Bicuspid or left atrioventricular) valve Figure 18.8a 6 Heart Valves Figure 18.8c, d 7 Atrioventricular Valve Function Figure 18.9 http://www.harunyahya.com/books/science/blood_heart/images/heart_valves.jpg 8 Semilunar Valve Function Figure 18.10 1. Incompetent valve (leaky) 2. Stenosis (narrowing) Pathology associated with valves: 9 http://www.moondragon.org/health/graphics/heartfailure.jpg American Heart Association Animation Link 10 Pericardial Layers of the Heart Figure 18.2 11 Cardiac Muscle Bundles Figure 18.3 12 Right and Left Ventricles Figure 18.6 13 Left ventricular wall is three times thicker than right ventricle Right ventricle crescent-shaped Left ventricle- cylindrical Interventricular septum RV wall LV wall 14 Coronary Circulation: Arterial Supply Figure 18.7a 15 Coronary Circulation: Venous Supply Figure 18.7b 16 http://www.aurorahealthcare.org/healthgate/images/si55551781.jpg http://static.howstuffworks.com/gif/adam/images/en/coronary-artery- balloon-angioplasty-procedure-part-4-picture.jpg Coronary Artery Bypass Graft (CABG) Coronary Stent http://www.nlm.nih.gov/medlineplus/ency/images/ency/fullsize/19005.jpg n Angioplasty 17 Cardiac Muscle is specialized striated muscle Figure 18.11 No Neuromuscular junctions Automaticity Conduction propagated by gap junctions Long refractory period O2 Dependent to produce ATP Lactic acid Glucose Fatty acids 18 Thick Filaments Thin Filaments 1 Sarcomere Z Line Sarcomere Shortening Sliding Filament Theory During contraction the thin filaments slide past the thick filaments so that actin and myosin overlap to a greater degree 19 Figure 9.12 ATP ADP ADP ATP hydrolysis ADP ATP Pi Pi Myosin head (high-energy configuration) Myosin head attaches to the actin myofilament, forming a cross bridge. Thin filament As ATP is split into ADP and Pi, the myosin head is energized (cocked into the high-energy conformation)....
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Chapter 18 Heart Spring 2011 post - 1 The Cardio Vascular...

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