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Arteries

take blood away from the heart

Capillaries

where the gas exchange occurs; allows O2 into cells and CO2 out

Veins

brings blood to the heart

Arterioles

carry oxygenated blood

Venules

carry deoxygenated blood

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Tricuspid Valve

between RA and RV

Pulmonary Valve

between RV and PA

Mitral Valve

between LA and LV

Aortic Valve

between LV and Aorta

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Right Atrium

blood enters here from the body

Right Ventricle

blood leaves here to go to lungs

Left Ventricle

blood leaves here to go to the rest of the body

Left Atrium

blood enters here from the lungs

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Interatrial Septum

separates atria

Interarterial Septum

separates ventricles

Endocardium

innermost lining of heart wall and valves

Myocardium

middle muscular lining of heart wall

Pericardium

fibrous sac surrounding heart