BIOS 1030 Lecture Notes - Lecture 11: Heart Valve, Pulmonary Valve, Aortic Valve
18 Oct 2016
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Concept: arteries carry blood away from the heart, the blood is leaving the heart then leads to other arteries then returns to veins. Three types of blood vessels transport blood. Exchange solutes and water with cells of the body. Precapillary sphincters: control blood flow into capillaries. Selective exchange of substances with the interstitial fluid. Three mechanisms assist venous return to the heart. Layers of the heart : epicardium: thin layer of epithelial and connective tissue, myocardium: thick layer of cardiac muscle, endocardium: thin layer of endothelial tissue. Deoxygenated blood from the body into heart. Through the vena cava to the right atrium. Through the right atrioventricular valve to the right. Through the pulmonary semilunar valve to the pulmonary trunk and the lungs. Oxygenate blood from lungs to heart: through the pulmonary veins to the left atrium, through the left atrioventricular valve to the left ventricle. Systemic circuit delivery of oxygenated blood to tissues.
