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closes when the left ventricle is contracting

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the muscular middle layer, thickest layer

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a double layered membrane that covers the outside of the heart

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what blood is made of

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carries blood to the lungs

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receives blood

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receives blood and pumps the blood to pulmonary artery

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a muscular wall that separates the heart into the right and left side

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a period of ventricle contraction

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platelets

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closes when the right ventricle contracts

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blood vessels that carry blood back to the heart