The Circulatory and Respiratory System

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Across
  1. 3. blood vessels that carries blood AWAY from the heart
  2. 6. blood vessels that carries blood TO the heart
  3. 7. air sacs at the end of the tiny tubes in the lung
  4. 9. the muscle that helps expand and contract the lungs to help you breathe
  5. 10. the system of lungs and connecting tubes that transport gases from the blood
Down
  1. 1. muscle that pumps blood
  2. 2. the system of blood vessels and organs that transport blood to all cells in the body
  3. 4. the tiny air tubes connected to the alveoli in your lungs
  4. 5. the smallest blood vessels
  5. 8. the organ where oxygen and carbon dioxide pass between the atmosphere and blood