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Unformatted text preview: 2-25-08 anatomy notes1.Circulatory Systema.Cardiovascular Systemi.Heart Structure1.Chambers (4)a.Upper Chambers (L&R atria)i.Thin-walled-open into respective lower chambers (L&R ventricles)ii.L&R atrio-ventricular orifices-openings located between upper & lower chambersiii.Right atrium-connected to inferior and superior vena cavae1.Tricuspid Valve located in R. Atroventricular Orifice (composed of 3 flaps of tissue made of endocardium[inner layer of heart])iv.Left Atrium-connected to 4 pulmonary veins (2 from each lung)1.Bicuspid Valve (or mitral valve) located in left atrioventricular orifice made of 2 flaps of tissue derived from endocardium of heart2.Lower Chambers (L&R ventricles)-thick-walled; highly muscular; do most of the pumping action of the hearta.Separated by interventricular septum (or sulcus) location of coronary arteries/veins in grooveb.Papillary muscles extend out of the ventricles & are connected to chordae tendinae which in turn connect to either the bicuspid or tricuspid valve...
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