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Circulatory System


Cardiovascular system The body system that consists of the heart, blood vessels, and blood.
heart A hollow, muscular organ that pumps blood throughout the body.
atrium Each of the two upper chambers of the heart that receives blood that comes into the heart.
pacemaker A group of cells located in the right atrium that sends out signals that make the heart muscle contract and that regulates heartbeat rate.
ventricle A lower chamber of the heart that pumps blood out to the lungs and body.
valve A flap of tissue in the heart or a vein that prevents blood from flowing backward.
artery A blood vessel that carries blood away from the heart.
capillary A tuny blood vessel where substances are exchanged between the blood and the body cells.
vein A blood vessel that carries blood back to the heart.
aorta The largest artery in the body.
coronary artery An artery that supplies blood to the heart itself.
pulse The alernating expansion and relaxtion of an artery wall as blood travels through an artery.
diffusion The process by which molecules move from an area of higher concentration to an area of lower concentration.
pressure The force exerted on a surface divided by the total area over which the force is exerted.
blood pressure The pressure thatis exerted by the blood against the walls of blood vessels.