Circulatory System

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Across
  1. 5. the upper chamber of the heart
  2. 8. arteries then branch into tiny vessels called these
  3. 9. pumps the blood through the pulmonary arteries
  4. 12. the thing muscular wall that divides the two sides of the heart
  5. 13. receives oxygen-rich blood from the lungs and passes it to the left ventricle
Down
  1. 1. the lower chamber of the heart
  2. 2. pumps the oxygen-rich blood out of the heart
  3. 3. receives oxygen-poor blood and passes it to the right ventricle
  4. 4. the largest artery in the body
  5. 6. carry the oxygen-rich blood to the left atrium of the heart
  6. 7. vessels that transport blood away from the heart
  7. 10. vessels that transport blood towards the heart
  8. 11. a vital organ that is divided into a right and left side by a thin muscular wall