Cardiovascular System - A

Cardiovascular System - A - Anatomy and Physiology of the...

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    Anatomy and Physiology of the Cardiovascular System
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    Location and size of the heart Heart is located in the mediastinum, a  mass of tissue in the center of the  thoracic cavity Lies slightly to the left of midline Weighs about 10 oz, is the size of a  person’s fist Pointed end (bottom) is the apex Flat end (top) is the base
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    Cross-section of the mediastinum
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    Pericardium Peri = around, card = heart A triple-layer bag that surrounds the  heart Keeps the heart in position, provides  cushioning, allows movement Fibrous pericardium is the outer layer  that attaches to diaphragm and sternum
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    Pericardium Serous pericardium = thinner, inner  membrane, forms a double layer Parietal layer and visceral  layer/epicardium form the serous  pericardium Pericardial fluid exists between parietal  and visceral layers
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    The heart wall Three layers: -epicardium is outer layer (visceral layer  of serous pericardium) -myocardium is middle layer, thickest,  this is the cardiac muscle -endocardium is inner layer, very thin and  smooth, is continuous with the blood  vessels
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    The heart wall
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    Heart Chambers Two superior chambers:  -right and left atria Two inferior chambers: -right and left ventricles The atria and ventricles are separated by  the interatrial septum and interventricular  septum, respectively
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    Main vessels in the heart Right atrium receives deoxygenated  blood from  superior and inferior vena  cava and coronary sinus
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Cardiovascular System - A - Anatomy and Physiology of the...

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