| A | B |
|---|
| Blood Vessel | Tube that carries blood through the body |
| Artery | Large vessel that carries blood away from the heart |
| Arteriole | Small branch of an artery |
| Capillary | Microscopic vessel that is the site of exchange of gases and nutrients |
| Venule | Small vein that collects blood from capillaries |
| Vein | Large vessel that carries blood toward the heart; contains valves |
| Lumen | Inner space of a blood vessel |
| Endothelium | Inner lining of blood vessels |
| Aorta | Large artery that carries oxygen-rich blood from heart to the body |
| Pulmonary Arteries | Large arteries that carry blood from heart to lungs |
| Pulmonary Veins | Large veins that carry blood from lungs to heart |
| Superior Vena Cava | Large vein that returns blood from upper body to heart |
| Inferior Vena Cava | Large vein that returns blood from lower body to heart |
| Systemic Circulation | Flow of blood between left side of heart and the organs of the body |
| Pulmonary Circulation | Flow of blood between right side of the heart and the lungs |
| Gas Exchange | Exchange of oxygen and carbon dioxide |
