| A | B |
|---|
| Cardiovascular system | The body system that consists of the heart, blood vessels an dblood |
| Ventricle | A lower chamber of the heart that pumps blood out to the lungs and body |
| Arteries | A blood vessel that carries blood away from the heart |
| Aorta | The largest artery in the body |
| Diffusion | The process by which molecules move from an area of higher concentration to an area of lower concentration |
| Plasma | The liquid part of e blood |
| Plasma | The liquid part of blood |
| Hemoglobin | An iron containing protein that binds chemically to oxygen molecules |
| Heart | A hollow muscular organ that pumps blood throughout the body |
| Valve | A flap of tissue in the heart or a vein that prevents blood from flowing backwards |
| Capillaries | A tiny blood vessel where substances are exchanged between the blood from flowing backwards |
| 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 |
| Pacemaker | A group of cells located in the right atrium that sends out signals that make the heart contract and regulate the heart beat |
| Red blood cells | A cell in the blood that takes up oxygen in the lungs and delivers it to cells elsewhere |
| Veins | A blood vessel that carries blood back to the heart |
| Platelets | A cell fragment that plays an important part in forming blood clots |
