Human Body Systems

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Across
  1. 2. takes in CO2 and expels Co2
  2. 5. tiny sacs that exchange of oxygen and carbon dioxide occurs in your blood system
  3. 7. pipe that connects the mouth and lungs
  4. 9. allows air to enter and exit the body
  5. 10. takes oxygen rich blood from the heart to the body
Down
  1. 1. Muscles that move up and down to control the movement of the lungs
  2. 3. attached to bones
  3. 4. found in all organs
  4. 6. found in the heart
  5. 8. pumps blood throughout the body