| A | B |
|---|
| cardiovascular system | the blood system that consists of the heart,blood vessels,and blood,and that carries needed substances to cells and carries waste products away from cells |
| heart | a hollow,muscular organ that pumps blood throughout the body |
| atrium | each of two upper chambers that receives blood that comes from the heart |
| ventricle | the lower chamber of the heart, which 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 |
| pacemaker | a group of cells located in the right atrium that |
| 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 |
| aorta | the largest artery in the body |
| vein | a blood vessel that carries blood BACK TO the heart |
| coronary artery | an artery that supplies blood to the heart itself |
| diffusion | the process by which molecules move from an area in which they are highly concentrated to an area in which they are less concentrated |
| blood pressure | that pressure that is exerted by the blood against the walls of blood vessels |
| plasma | the liquid part of blood |
| red blood cell | a cell in the blood that takes up oxygen in the lungs and delivers it to cells elsewhere in the body |
| hemoglobin | an iron-containg protein that binds chemically to oxygen molecules and makes up most of a red blood cell |
| white blood cell | a blood cell that FIGHTS disease |
| platlet | a cell fragment that plays an important part in forming blood CLOTS |
| fibrin | a chemical that is important in blood clotting because it forms a fiber net that traps red blood cells |
| blood transfusion | the transference of blood from one person to another |
| lymphatic system | a network of veinlike vessels that returns the fluid that leaks out of blood vessels to the bloodstream |
| lymph | the fluid that the lymphatic system collects and returnd to the bloodstream |
| lymph node | a small knob of tissue in the lymphatic system that filters lymph |
| atherosclerosis | a condition in which an artery wall thickens as a result of the buildup of fatty materials |
| heart attack | a condition in which blood flow to a part of the heart muscle is blocked,which causes heart cells to die |
| hypertension | a disorder in which a person's blood pressure is consistently higher than normal |
