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Published byBritney Catherine Townsend
Modified over 5 years ago
Main function: Transportation Blood = transport vehicle Heart = pump Blood vessels = network of tubes
Anatomy of Heart Size of fist Weight < 1 lb. Apex points toward left hip Flanked by lungs Surrounded by pericardium (double-walled sac)
Layers of the Heart Wall 1.Epicardium – outer layer (pericardium) 2.Myocardium – cardiac muscle 3.Endocardium – endothelium lines chambers Heart chamber
Heart Chambers Atrium (R & L): receive blood (entryway) Ventricle (R & L): pump blood out Septum: wall between atria & ventricles Valves: prevent backflow of blood Right Side Left Side
Double Circulation Loop Pulmonary circuit: blood to/from lungs Systemic circuit: blood to/from all body tissues
Pathway of blood through heart
Pathway of Blood Through Heart To Right Atrium: Superior vena cava (above diaphragm) Inferior vena cava (below diaphragm) Coronary sinus (from myocardium) To Left Atrium: 4 Pulmonary veins (lungs to heart) Right Ventricle: 2 Pulmonary arteries (to lungs) Left Ventricle: Aorta (to body) Coronary arteries Tricuspid valve Mitral (bicuspid) valve Aortic valve Pulmonary valve
Pulmonary circuit = low pressure Systemic circuit = high resistance to blood flow More powerful pump 3X as thick as right ventricle Right Ventricle Left Ventricle
Coronary Circulation Coronary arteries Coronary veins
Heart Valves Atrioventricular (AV) valves (tricuspid, bicuspid) Semilunar valves (pulmonary, aortic)
Heart Valves Chordae tendineae: anchors valve flaps in their closed position
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