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Unformatted text preview: Lecture 33 – Circulation I I – The Heart and Lymphatics A. General Description 1) Function – the pump blood throughout the body 2) Tissues of the heart – cardiac muscle, connective tissue, endothelial tissue, nervous tissue 3) Mediastinum – the cavity in which the heart is located, on both sides of the heart are the lungs and the diaphragm is beneath the heart- Also, the esophagus, trachea, and thymus gland are located here 4) Pericardium – there is a layer of pericardium attached to the heart, a layer of fluid (to reduce friction, and an outer layer of pericardium 5) Structure a) Chambers – have 4 chambers- Atria – 2; the receiving chambers; thin-walled- Ventricles – 2; the pumping chambers; thick-walled b) Valves – 2 major types- Atrioventricular – between the atria and ventricles; chordae tendinae (keep valves from opening too wide?)- Semilunar – valves were the blood exits the heart c) Blood flow- Deoxygenated blood – the anterior (cranial, superia) and inferior vena cava bring blood to the right atrium. The deoxygenated blood passes through the atrioventricular valve (tricuspid valve) into the right ventricle. Then the deoxygenated blood goes up through the pulmonary semilunar valve through the pulmonary trunk to the pulmonary artery to the lungs (where it picks up...
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This note was uploaded on 05/30/2008 for the course BS 131 taught by Professor Smith during the Spring '08 term at University of the Sciences in Philadelphia.
- Spring '08