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Circulatory System
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Term | Definition |
---|---|
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. |