Across
- 4. Blood cells responsible for clotting
- 5. The valve that regulates blood flow from the heart into the aorta.
- 7. Cells that carry oxygen-
- 8. A vessel that carries oxygen-rich blood to the body.
- 9. Largest blood vessels; carries blood away from the heart
- 11. A lower chamber of the heart that receives blood from an atrium and pumps it to the arteries.
- 13. Cells that fight disease
- 15. An upper chamber of the heart that receives and holds blood that is about to enter the ventricle.
- 16. The largest artery in the body; it conducts freshly oxygenated blood from the heart to the tissues.
Down
- 1. Resistance to disease
- 2. Medium sized blood vessels; carries blood to the heart
- 3. Smallest blood vessels; carries blood to the extremities
- 5. Air sacs in the lungs where oxygen and carbon dioxide are exchanged.
- 6. The amount of blood the heart pumps through the circulatory system in one minute.
- 10. Specialized protein that carries oxygen on red blood cells
- 12. "Liquidy" part of the blood
- 14. main organ of the cardiovascular system