Circulatory System

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a flap in the heart that allows blood to flow only from the atrium to the ventricle

any blood vessel that carries blood away from the heart

the upper chamber of the heart, which receives blood from the veins

a structure in the lungs where blood picks up oxygen and releases carbon dioxide

the movement of blood throughout the body

the lower chamber of the heart, with strong muscles that pump blood to the body

A blood vessel that carries blood back to the heart

a tube that carries blood, such as an artery, a vein, or a capillary