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Opens to allow blood to be pumped from the heart to the lungs

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Prevents backflow of blood between ventricle and atrium.

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one of two chambers in the heart that collect blood.

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They are the smallest of the body's blood vessels. Transfers oxygen & nutrients from blood to muscles.

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veins are blood vessels that carry blood towards the heart

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Separates two chambers, found between the chambers of the heart.

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Blood enters the heart through the two atria and exits through both the venticles

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Arteries takes blood from the heart to the rest of the body.

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the main artery of the body, supplying oxygenated blood to the circulatory system

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One of four valves in the heart. Permits blood to flow one way only.