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heart
muscular cone-shaped organ, located behind sternum and between the lungs, pumping action circulates blood throughout the body
atrioventricular valves
tricuspid and mitral valves, keep blood flowing in one direction
semilunar valves
pulmonary and aortic valves
pericardium
two layer sac surrounding the heart, facilitates movement
epicardium
covers the heart
myocardium
middle, thick, muscular layer
endocardium
inner lining of the heart
blood vessels
tubelike structures that carry blood throughout the body
arteries
blood vessels that carry bloody away from the heart
arterioles
smallest arteries
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