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Located between the left ventricle and the aorta, the largest artery in the body.

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Abnormal heart rhythms and can be mild to life-threatening.

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Carry blood away from the heart.

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Transports oxygen from lungs to the body cells, carbon dioxide from the body cells to the lungs, nutrients from the digestive tract to the body cells, metabolic an waste products from the body cells to the organs of excretion.

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Connect arterioles with venules, the smallest veins.

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Also known as the transportation system of the body. Consists of the hearty, blood vessels, and blood.

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Brief period of rest

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Smooth layer of cells that lines the inside of the heart and is continuous with blood cells.

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Red blood cells

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Complex protein composed of a protein molecule called globin and an iron compound called heme.

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Receives oxygenated blood from the left ventricle.

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Receives blood from the left atrium and pumps blood into the aorta for transportation to the body cells.

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White blood cells

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Located below the left atrium and the left ventricle, closes when the left ventricle is contracting allowing blood to flow through.

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The muscular middle layer of the heart.

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Double-layered membrane, or sac, that covers the outside of the heart.

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90 percent water, with many dissolved or suspended, substances.

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Located between the right ventricle and the pulmonary artery, a blood vessel that carries blood to the lungs.

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Receives blood as it returns from the body cells.

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Receives blood from the right atrium and pumps blood into the pulmonary artery.

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The muscular wall that separates the heart into the right and left sides.

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Period of ventricular contraction.

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Called platelets. Fragments of blood cells because they lack nuclei and vary in shape and size.

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Is located between the right atrium and the right ventricle.

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Blood vessels that carry blood back to the heart.