| A | B |
|---|
| cardiovascular system | 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 |
| 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 |
| force | A push or pull exerted on an object |
| blood pressure | Pressure that is exerted by the blood against the walls of blood vessels |
| sphygmomanometer | An instrument that measures blood pressure |
| 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 a red blood cell |
| lymphatic system | A network of veinlike vessels that returns the fluid that leaks out of blood vessels to the bloodstream |
| lung | Part of the respiratory system that diffuses oxygen into the blood |
| trachea | Tube connecting mouth and lungs |
| atheroscerosis | 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 |
