| A | B |
|---|
| atrium | Two upper chambers of the heart that receives blood into the heart. |
| ventricle | 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 backwards. |
| capillary | A small blood vessel where substances are exchanged between the blood and the cells. |
| artery | A blood vessel that carries blood away from the heart. |
| veins | A blood vessel that carries blood back to the heart. |
| aorta | The largest artery in the body. |
| blood pressure | The pressure that is exerted by blood against the walls of blood vessels. |
| pulse | The alternating expansion and contraction of artery walls as blood travels through an artery. |
| septum | Muscle tissue that divides the left side of the heart from the right side. |
| cardiovascular system | The body system that consists of the heart, blood, and blood vessels. |
| heart | A hollow, muscular organ that pumps blood throughout the body. |
| plasma | The liquid part of the blood. |
| red blood cells | Carry oxygen from the lungs to the body cells; makes blood red. |
| white blood cells | The body's disease fighters. |
| atherosclerosis | A condition where an artery wall thickens due to the buildup of fatty materials. |
