Circulation and Respiration chapter 14
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Created by:
MrGarcia2881 on May 8, 2012
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15 terms
Terms | Definitions |
|---|---|
 cardiovascular system | The body system that consists of of the heart, blood vessels, and blood; circulatory system. |
| 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 tiny 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 alternating expansion and relaxation of an artery wall as blood travels through an artery. |
| diffusion | The process by which molecules move from an area of higher concentration into 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 that is exerted by the blood against the walls of blood vessels. |
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