| A | B |
|---|
| atrium | top chamber of the heart that receives blood entering the heart |
| ventricle | lower chamber of the heart that pumps blood out of the heart |
| pacemaker | small group of cells in the wall of right atrium that regulates heart rate |
| artery | blood vessels that carry blood away from the heart |
| capillary | branching from smallest arteries are these the smallest blood vessels |
| vein | large, thin-walled blood vessels that carry blood to the heart |
| blood pressure | force with which blood pushes against teh walls of your blood vessels |
| hypertension | high blood pressure-140/90 or greater |
| plasma | liquid component of the blood |
| red blood cell | cells that carry oxygen from the lungs to parts of your body |
| white blood cell | cells that help protect against disease and foreign substances |
| platelet | cell fragments that clot your blood |
| low-density lipoprotein | carry cholesterol to body tissues for use or storage |
| plaque | substance that builds up in artery walls |
| atherosclerosis | condition in which an artery wall hardens and thickens due to plaque buildup |
| high-density lipoprotein | pick up excess cholesterol from body tissues and artery walls and carry to liver |
| arrhythmia | irregular heartbeat |
| alveoli | tiny sacs at the end of the smallest tubes in lungs |
| diaphragm | dome-shaped muscle below the lungs |
| asthma | disorder in which respiratory passageways become inflamed |
| bronchitis | infection that causes the mucous membranes lining the bronchi to be inflamed |
