| A | B |
|---|
| pacemaker | controls heart's rhythm |
| plasma | liquid portion of the blood |
| atherosclerosis | most common cause of heart attack |
| fibrin | stops bleeding by trapping blood cells |
| septum | separates heart into left and right sides |
| valves | flaps of tissue that control flow of blood |
| cholesterol | fat like substance in the blood |
| bone marrow | where blood cells are produced |
| right ventricle | pumps blood to the lungs |
| transfusion | transferring blood from one person to another |
| left ventricle | pumps blood to the body |
| aorta | largest blood vessel |
| arteries | carry blood away from the heart |
| veins | carry blood back to the heart |
| hemoglobin | iron containing protein in red blood cells |
| capillary | smallest blood vessels |
| sphygmomanometer | measures blood pressure |
| platelets | cell fragments that help blood clot |
| white blood cells | fight invaders to the body |
| pulmonary arteries | carry blood to the lungs |
| blood pressure | the force of the blood and the resistance of the blood vessels |
| A, B, O, AB | four blood groups |
| liver and spleen | where blood cells are broken down |
| heart | pumping organ of circulatory system |
| atria | collecting chambers of the heart |
