The heart

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Across
  1. 5. Lower right chamber that pumps deoxygenated blood to the lungs
  2. 7. Upper right chamber that receives deoxygenated blood from the body
  3. 8. Blood low in oxygen, shown in blue in the diagram
  4. 9. Attached to heart valves, these prevent them from flipping backwards
  5. 10. Prevents backflow of blood between heart chambers
  6. 11. artery that carries oxygenated blood from the heart to the body
  7. 12. Blood rich in oxygen, shown in red in the diagram
Down
  1. 1. Upper left chamber that receives oxygenated blood from the lungs
  2. 2. Blood vessel that returns oxygenated blood from the lungs to the heart
  3. 3. Lower left chamber that pumps oxygenated blood to the body
  4. 4. Blood vessel that carries deoxygenated blood from the heart to the lungs
  5. 6. Large vein that carries deoxygenated blood from the body to the heart