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Chapter19HeartMarieb - Ch 19 Cardiovascular System The...

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Ch 19: Cardiovascular System - The Heart - Give a detailed description of the superficial and internal anatomy of the heart, including the pericardium, the myocardium, and the cardiac muscle. Trace the path of blood through the heart. Explain the functioning of the valves of the heart and how they relate to the heart sounds. Discuss the conductive pathway of the heart, and relate that to clinical uses of the ECG. Developed by John Gallagher, MS, DVM
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Circulation:: Overview Size of a Fist 250 350 grams Double Pump Oxygenated and deoxygenated blood About 16,000 liters/day! Pulmonary circuit Systemic Circuit
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Location of the Heart Posterior to the Sternum Within the Mediastinum Apex vs. Base
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sectional view: position immediately posterior to sternum . . .
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Cardiac Muscle Striated, aerobic, interwoven, branched, autorrhythmic Intercalated discs - gap junctions, strong desmosomes Functional syncytium Fig 21.3
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Cardiac Muscle Different from skeletal muscle?
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Pericardium - Sac 1. Fibrous pericardium (AKA heart sac)- tough, collagenous 2. Serous parietal pericardium (lines fibrous pericardium) 3. Pericardial space with 10-20 ml of pericardial fluid 4. Serous visceral pericardium (AKA epicardium) adheres to the outer heart surface
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Structure of Heart Wall Epicardium = visceral Pericardium (serosa) Myocardium : muscle tissue + c.t. + blood vessels + nerves Endocardium : simple squamous epithelium continuous with endothelium of blood vessels Pericardium Pericardial fluid Epicardium Myocardium Endocardium
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Fibrous Skeleton Internal c.t. network with lots of collagen and elastic fibers Encircles bases of great vessels Encircles bases of valves functions: Isolate atria from ventricles electrically Reinforce myocardium itself
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