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| Functions of the Circulatory system |
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| Acts as the body's transport system; supplies cells with oxygen, nutrients, hormones, salts, and removes waste; helps maintain constant body temperature; helps fight infections |
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| Blood vessels that carry blood away from the heart; have thick strong walls to withstand blood under pressure |
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| Blood vessels that carry blood back to the heart; have valves that help stop blood from flowing backward |
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| The smallest blood vessels in the body; cells travel single file through them; site of gas and food exchange |
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| Organ made of cardiac muscle that pumps blood through the heart |
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| Upper chambers of the heart - pump blood down to the ventricles |
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| Lower chambers of the heart - pump blood out of the heart |
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| The flow of blood around the body; blood leaves the heart from the left ventricle which is the strongest chamber of the heart |
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| The flow of blood from the heart to the lungs; blood leaves from the right ventricle |
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| A group of cells in the right atrium that send out signals telling the heart to contract; also called the sinoatrial node |
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| The alternating expansion and relaxation of the artery wall cause by the surging of blood when the heart beats |
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| The force exerted by blood against the vessel walls |
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| Pathway of blood through the body |
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| Right atrium, right ventricle, pulmonary artery, lungs, pulmonary vein, left atrium, left ventricle, through the body, back to the heart |
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| most numerous cell type in blood, carry oxygen using the protein hemoglobin |
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| The liquid part of blood; made mostly of water, also carries sugars, fats, vitamins, minerals, salts, hormones |
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| Cells in the blood that help fight infection |
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| Fragments of cells that help form blood clots |
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| Constant internal conditions; this system helps the body maintain it by supplying all cells with food, oxygen, removing waste, maintaining a constant body temperature by circulating warm blood |
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