body systems

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Across
  1. 3. Joins bone to bone, is flexible
  2. 4. Pair where one muscle contracts while other relaxes
  3. 6. Related to the heart
  4. 7. Used to store air for breathing
  5. 8. Another word for breathing
  6. 9. Gas used in respiration
  7. 13. System for ventilation
Down
  1. 1. Lubricated surface between bones
  2. 2. muscle between ribs
  3. 5. Made of 206 bones
  4. 10. Used in respiration
  5. 11. Joins muscle to bone
  6. 12. Contracts and relaxes to make lungs sutible volume