| A | B |
|---|
| arteries | oxygenated blood, away from body, under pressure, thick walls, no valves |
| veins | deoxygenated blood, blood toward the heart, blood not under pressure, thin walls, valves |
| Capillaries | One cell layer thick, site of gas (oxygen and carbon dioxide) exchange connect arteries and veins |
| Pulmanary Artery | The main artery carrying blood from the right ventricle to the lungs. This is the only artery carrying deoxygenated blood |
| Pulmanary vein | Main vein carrying blood from the lungs back to the left atria of the heart. This is the only vein carrying oxygenated blood |
| Venacava | Main vein carrying deoxygenated blood back to the heart from the body |
| left ventricle | Pumps deoxygenated blood through the pulmonary artery into the lungs to be oxygenated |
| aorta | Largest artery in the body |
| hemoglobin | The oxygen carrying portion of the blood. |
| stroke | Lack of oxygen to the brain |
| heart attack | Usually occurs when the heart muscle is deprived of oxygen for a period of time more than a minute or two |
