Circulation II - Circulation II- The Heart and Lymphatics...

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Circulation II- The Heart and Lymphatics A. General Description: Heart 1. function- pumps blood 2. Tissues a. cardiac muscle b. endothelial- smooth in valves to keep blood flowing easily c. elastic connective tissue- helps keep heart flexible for beating d. nerves 3. Mediastinum- space between sternum and heart 4. Pericardium- two layers, fluid in between, covers heart, prevents friction from beating 5. Structure a. chambers - atria- receives blood - ventricle- pumps blood, thick walled b. valves - atrioventricular- between atria and ventricle - semilunar- at base of vessels leaving the heart 6. blood flow a. Deoxygenated blood - enters right atria from superior and inferior vena cava - goes through atrioventricular valve (tricuspid) into right ventricle - goes from right ventricle through pulmonary semilunar valve into pulmonary trunk - goes through pulmonary artery to lungs b. Oxygenated blood - from lungs through pulmonary veins into left atrium - through atrioventricular valve (bicuspid, Mitral) into left ventricle (most muscular)
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Circulation II - Circulation II- The Heart and Lymphatics...

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