mixed systems

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Across
  1. 5. System that controls movement
  2. 6. Liquid waste from body
  3. 8. Muscle layer of heart
  4. 11. Cells that carry oxygen
  5. 12. Muscle attached to bones
  6. 13. Process of breathing
Down
  1. 1. Muscle you can control
  2. 2. Filters blood and produces urine
  3. 3. Prevents blood backflow
  4. 4. Small vessels for exchange
  5. 7. Movement of blood in body
  6. 9. Heart muscle type
  7. 10. Gas carried in blood
  8. 12. Involuntary muscle in organs