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Science Ch 4 vovab
Cardiovascular system
| Term | Definition |
|---|---|
| cardiovascular system | The body 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. |
| artery | A blood vessel that carries blood away from the heart. |
| atrium | Each of the two upper chambers of the heart that receives blood that comes into the heart. |
| ventricle | Each of the two lower chambers of the heart that pumps blood out of the heart. |
| valve | A flap of tissue in the heart or vein that prevents blood from flowing backward. |
| pacemaker | A group of cells located in the right atrium that sends out signals to make the heart muscle contract and that regulates the heartbeat rate. |
| 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 |
| force | A push or pull. |
| coronary artery | An artery that supplies blood to the heart itself. |
| diffusion | The process by which molecules move from an area where they are highly concentrated to an area in which they are less concentrated. |
| pressure | The force that something exerts over a given area. |
| blood pressure | The pressure that is exerted by the blood against the walls of the blood vessels. |
| sphygmomanometer | An instrument that measures the blood pressure. |
| plasma | The liquid part of the 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-containing protein that binds chemically to oxygen molecules and makes up most of red blood cells. |
| white blood cell | A blood cell that fights disease. |
| platelet | A cell fragment that play 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 return 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 the result of the buildup of fatty materials. |
| cholesterol | A waxy, fatlike substance, only found in animal products, that is an important part of body's cells; can build up on artery walls. |
| 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 constantly higher than normal. |
| lymph | The fluid that the lymphatic system collects and returns to the bloodstream. |
Created by:
amanda.jordan
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