The Circulatory Syst
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| cardiovascular system | also called the circulatory system, consists of the heart, blood vessels, and blood
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| heart | a hollow, muscular organ that pumps blood throughout the body
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| atrium | referring to one of the two upper chambers that receives blood into the heart
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| pacemaker | sends out signals that make the heart muscle contract
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| ventricle | referring to one of the two lower chambers the pumps blood out of the heart
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| valve | a flap of tissue that prevents blood from flowing backward
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| arteries | blood vessels that carry blood away from the heart
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| capillaries | tiny, narrow blood vessels where substances are exchanged between the blood and body cells
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| veins | blood vessels that carry blood back to the heart
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| aorta | the largest artery in the body
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| coronary arteries | the term used to describe blood vessels that carry blood to the heart itself in order to supply the cardiac muscle with oxygen-rich blood
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| pulse | caused by the alternating expansion and contraction of the artery walls
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| diffusion | the process by which molecules move from an area of higher concentration to an area of lower concentration
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| blood pressure | a force exerted on the walls of blood vessels that is caused by the force with which the ventricles contract
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| blood | made up of plasma, red blood cells, white blood cells, and platelets
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| plasma | the liquid part of the blood
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| red blood cells | take up oxygen in the lungs and deliver it to cells elsewhere in the body
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| hemoglobin | an iron-containing protein that binds with oxygen
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| white blood cells | the body's disease fighters
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| platelets | cell fragments that play an important part in forming blood clots
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| lymphatic system | a network of veinlike vessels that returns the fluid to the bloodstream
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| lymph nodes | filter lymph, trapping bacteria and other disease-causing microorganisms in the lymph fluid
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| atherosclerosis | a condition in which an artery wall thickens as a result of the buildup of fatty materials
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| heart attack | occurs when blood flow to part of the heart muscle is blocked
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| hypertension | a condition in which a person's blood pressure is consistently higher than normal
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