transportation system

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Across
  1. 5. lower chamber of heart
  2. 6. enter our body.
  3. 7. carry blood from the heart to all parts of the body
  4. 10. which fight against germs that
  5. 11. carry blood from all parts of the body back to the heart
Down
  1. 1. pigment in RBC
  2. 2. chambers in human heart
  3. 3. a muscular pump
  4. 4. gas that is required for cellular respiration
  5. 7. upper chamber of heart
  6. 8. walls of artery
  7. 9. stops the backflow of blood