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Heart Notes - THE CIRCULATORY SYSTEM Also called the...

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THE CIRCULATORY SYSTEM Also called the cardiovascular system Consists of the heart and blood vessels, whose function is to circulate blood around the body This transport system contributes to homeostasis by transporting O2, CO2, wastes, electrolytes, and hormones from one part of the body to another
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SCHEMATIC REPRESENTATION OF THE CIRCULATORY SYSTEM
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49.4 Figure 49.4 – Part 2 Figure 49.4 – Part 2 figure 49-04b.jpg THE HUMAN HEART
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HEART VALVES ENSURE BLOOD FLOWS IN THE PROPER DIRECTION valves open and close passively because of pressure differences the right and left atrioventricular (AV) valves separate the atrium and ventricle on the respective sides, and prevent backflow of blood from the ventricles into the atria during ventricular emptying the right AV valve consists of 3 cusps (flaps) and is called the tricuspid valve the left AV valve , consisting of 2 cusps is called the bicuspid or mitral valve the edges of the AV valve cusps are attached by thin, chords of tendon-like tissue (chordae tendineae) to small papillary muscles arising from the inner ventricular walls the papillary muscles contract as the ventricles contract, pulling downward on the chordae tendineae and preventing the valves being pushed upward by the pressure gradient the aortic and pulmonary valves (also called semilunar valves ) are located where the major arteries (pulmonary trunk and aorta) leave the ventricles, and prevent backflow of blood into the heart
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