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science
| Term | Definition |
|---|---|
| cardiovascular system | The body system that consist of the heart, blood vessels, and blood; also called the circulatory system. |
| Coronary artery | An artery that supplies blood to the heart itself. |
| Vein | A blood vessel that carries blood back to the heart. |
| Blood pressure | The pressure that is exerted by the blood against the walls of the blood vessels |
| red blood cells | A cell in the blood that takes up oxygen in the lungs a and delivers it to cells elsewhere in the body. |
| Hearts | a hollow, muscular organ that pumps blood throughout the body. |
| Pacemaker | A group of cells located in right atrium that sends out signals that make the heart muscle contract and that regulates heart rate. |
| Aorta | The largest artery in the body; receives blood from the left ventricle. |
| Diffusion | The process by which molecules move from an area of higher concentration to an area of lower concentration. |
| White blood cells | A blood cell that fights disease. |
| Atrium | Each of the two upper chambers of the heart that receives blood that comes into the heart. |
| Artery | A blood vessel that carries blood away from the heart. |
| valve | A flap of tissue in the heart or a vein that prevents blood from flowing backward. |
| Plasma | The liquid part of blood. |
| Ventricle | Each of the two lower chambers of the heart that pumps blood out of the heart. |
| Capillary | A tiny blood vessel where substances are exchanged between the blood and the body cells. |
| Pulse | The alternating expansion and Relaxation of an artery wall as blood travels through an artery. |
| Platelets | A cell fragment that plays an important part in forming blood clots. |