Cardiovascular System 1

Cardiovascular System 1 - THE CARDIOVASCULAR SYSTEM The...

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THE CARDIOVASCULAR SYSTEM
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The Heart Figure 11.1
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The Cardiovascular System A closed system of the heart and blood vessels The heart pumps blood Blood vessels allow blood to circulate to all parts of the body The function of the cardiovascular system is to deliver oxygen and nutrients and to remove carbon dioxide and other waste products
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The Heart: Heart Wall Three layers Epicardium Outside layer This layer is the parietal pericardium Connective tissue layer Myocardium Middle layer Mostly cardiac muscle Endocardium Inner layer Endothelium
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Myocardium is criss- crossed and arranged in figure 8-shaped bundles shown in (b). MYOCARDIUM IS CRISS-CROSSED
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The Heart Wall Figure 20–4
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Myocardium = Muscular Wall =Cardiac Muscle Intercalated disks convey the force of contraction from cell to cell and propagate action potentials Muscle tissue is CONTRACTILE tissue. Cardiac Muscle Cells are Small, w/ a single nucleus. Short cells. Involuntary contractions
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External Anatomy - Anterior
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What is the path of blood flow through the heart, and what are the major blood vessels, chambers, and heart valves?
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Heart Valves Atrioventricular (AV) valves right AV valve has 3 cusps (tricuspid valve) left AV valve has 2 cusps (mitral, bicuspid valve) chordae tendineae - cords connect AV valves to papillary muscles (on floor of ventricles) Semilunar valves - control flow into great arteries pulmonary: right ventricle into pulmonary trunk aortic: from left ventricle into aorta
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Heart Valves
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Heart Valves
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AV Valve Mechanics Ventricles relax pressure drops semilunar valves close AV valves open blood flows from atria to ventricles Ventricles contract AV valves close pressure rises semilunar valves open blood flows into great vessels
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The Heart: Chambers Right and left side act as separate pumps Four chambers Atria Receiving chambers Right atrium Left atrium Ventricles Discharging chambers Right ventricle Left ventricle Figure 11.2c
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Blood Flow Through Heart
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The Vena Cava Delivers systemic circulation to right atrium Superior vena cava: receives blood from head, neck, upper limbs, and chest Inferior vena cava: receives blood from trunk, and viscera, lower limbs
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The Heart: Associated Great Vessels Aorta Leaves left ventricle Pulmonary arteries Leave right ventricle Vena cava Enters right atrium Pulmonary veins (four) Enter left atrium
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Return from Pulmonary Circuit Blood gathers into left and right pulmonary veins Pulmonary veins deliver to left atrium Blood from left atrium passes to left ventricle through left atrioventricular (AV) valve 2-cusp bicuspid valve or mitral valve
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Blood Circulation Figure 11.3
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DOUBLE PUMP
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Dichotomous Functions for Left & Right Side of Heart Right Side :
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Cardiovascular System 1 - THE CARDIOVASCULAR SYSTEM The...

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