205textnotes28 - The Heart Figures 14-7,14-9 Four...

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The Heart : Figures 14-7,14-9 Four muscular (cardiac muscle) chambers organized into 2 separate pumps each with: 1 atrium and 1 ventricle. Ventricles are very muscular and when they contract, they propel blood out to either pulmonary or systemic circulation. Blood flow into and out of the ventricles is controlled by valves the valves are attached via connective tissue to papillary muscles these muscles ensure a limited range of motion of valves so that blood is always moving unidirectionally . right side of heart : includes right atrium and right ventricle separated by atrioventricular valve (a-v valve) called the tricuspid valve . Blood is pumped through the pulmonary circulation through the pulmonary semilunar valve . left side of heart : includes left atrium and left ventricle separated by a-v valve called the mitral valve . Blood is pumped through the systemi c circulation through the aortic semilunar valve . --------------------------------------------------------------------------
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