Chapter 19 The Heart

Chapter 19 The Heart - Closing of semilunar valves...

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1 The Heart Chapter 19 The Heart Continuously working pump (70-80 bpm) 42,000,000 beats/year 700,000 gallons/year Less than 1lb Heart wall Three layers Epicardium Myocardium Endocardium Pericardium? Chambers of the heart Right atrium Right ventricle Left atrium Left ventricle Valves of the heart Right atrioventricular Pulmonary (semilunar) Left atrioventricular Aortic (semilunar) Right AV Tricuspid Valve open Heart relaxed Valve closed Heart contracting Pulmonary semilunar Moon-shaped flaps Valve open Heart contracting Valve closed Heart relaxed Left AV Bicuspid Mitral Valve open Heart relaxed Valve closed Heart contracting Aortic semilunar Moon-shaped flaps Valve open Heart contracting Valve closed Heart relaxed Flow through the valves 1 2 3 4 5 6 7 8 9 10
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2 Force exerted against vessel walls Systole Diastole 120/80 normal >140/100 high <100/60 low “Lub-dub” Closing of av valves
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Unformatted text preview: Closing of semilunar valves Auscultation Circulatory routes Systemic circulation Pulmonary circulation Coronary circulation* Myocardial infarction Heart attack Myocardial necrosis Thrombus formation in coronary artery Myocardial infarction Heart attack Leading cause of mortality/morbidity in the US 500,000-700,000 deaths per year in US 1,300,000 non fatal reports 40-70 years: males predominantly Over 70 years: both sexes equal Myocardial infarction Strategies for preventing/treating MI Exercise Good diet Quit smoking Surgery Coronary bypass Angioplasty Coronary bypass Angioplasty Coronary artery stents Conduction system of the heart The heartbeat originates in and is conducted through the heart without extrinsic stimulation. 11 1 2 12 13 14 15 16 17 18 19 20...
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Chapter 19 The Heart - Closing of semilunar valves...

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