HLSC 1F90 Lecture Notes - Lecture 6: Arteriosclerosis, Interventricular Septum, Heart Valve
24 Feb 2015
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Top of the heart thin walled low pressure chambers separated by interatrial septum. Right atrium receives deoxygenated blood from the venous system (inferior vena cava, superior vena cava, coronary sinus) tricuspid valve-3 leaflets, prevent backflow of blood. Left atrium receives oxygenated blood from the pulmonary veins. 2 mm think (thinker than right)- higher pressure system. Pump blood away from the heart via semilunar valves. The left ventricle is bigger and bigger because it pumps blood out to entire body. Superior aspect forms a cone-shaped outflow tract leading to pulmonary artery. High pressure chamber because it pumps blood to entire body longer and thicker than right ventricle (3x thicker, 9-11 mm think) works the hardest, first to get weak. Sa node, pacemaker, tells atria to contract, sets heart rate. Goes to av node, delayed to let ventricles fill with blood so they can pump as much possible to body.
