Ch14 Heart

Ch14 Heart - 1 Cardiovascular Cardiovascular System System...

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Unformatted text preview: 1 Cardiovascular Cardiovascular System System + Cardiovascular System Cardiovascular System s A closed system consisting of the heart & blood vessels s Function is to deliver O 2 & nutrients to body tissues, and remove CO 2 & metabolic waste from tissues The Heart The Heart s About the size of a fist, cone- shaped, weighs < 1 lb s Sits between the lungs, in the middle cavity of the thorax s Pointed apex rests on diaphragm directed toward the left hip s Broader posterosuperior base points to the right shoulder s The great blood vessels emerge from the posterosuperior base The Heart The Heart Heart Covering and Heart Wall Heart Covering and Heart Wall s Serous pericardium : a double sac membrane enclosing the heart filled with serous fluid in the pericardial cavity Heart Covering Heart Covering s Endocardium : innermost layer s Myocardium : middle thickest layer of cardiac muscle s Epicardium (visceral pericardium) s Parietal pericardium s Fibrous pericardium s outermost fibrous layer s protects & anchors the heart to surrounding structures 2 Heart Covering Heart Covering s Intercalated discs = specialized cell membranes in the myocardium that allow rapid conduction of impulses between cardiac muscle cells The Heart Chambers The Heart Chambers The Heart Chambers The Heart Chambers s 2 Atria = superior receiving chambers s interatrial septum divides the atria into a right & a left atrium s blood flows into them (from veins) under low pressure (not important in blood pumping activity) s 2 Ventricles = inferior discharging chambers s interventricular septum divides the ventricles into a right & a left ventricle s the actual heart pumps s 3 x thicker than the atria Arteries and Veins Arteries and Veins s Arteries = blood vessels leaving the heart s almost all arteries carry oxygenated blood s pulmonary arteries are the only arteries in the adult body that carry deoxygenated blood because they are going to the lungs s Veins = blood vessels entering the heart s almost all veins carry deoxygenated blood s pulmonary veins are the only veins in the adult body that carry oxygenated blood because they are coming from the lungs Associated Great Vessels Associated Great Vessels Associated Great Vessels Associated Great Vessels s Aorta s leaves the left ventricle s oxygenated blood s branches to systemic arteries s Vena cavae (2) s superior & inferior s enter the right atrium s deoxygenated blood s 4 Pulmonary veins s come from the lungs s enter the left atrium s oxygenated blood s Pulmonary Trunk s leaves the right ventricle s splits into 2 right & 2 left arteries f to the lungs s deoxygenated blood 3 Heart Circuits Heart Circuits s The heart is a double pump (right & left sides act as separate pumps) 1. Pulmonary Circuit 2. Systemic Circuit Pulmonary Circuit Pulmonary Circuit...
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This note was uploaded on 05/04/2008 for the course HP 320 taught by Professor Islam during the Spring '08 term at USC.

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Ch14 Heart - 1 Cardiovascular Cardiovascular System System...

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