Respiratory system

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Across
  1. 7. Blood vessels that carry blood away from the heart.
  2. 8. Gas needed for energy production.
  3. 9. Organs where gas exchange takes place.
  4. 10. Organ that pumps blood throughout the body.
  5. 11. Tiny air sacs where gas exchange happens.
  6. 12. Main passageway for air into the lungs.
Down
  1. 1. Blood vessels that carry blood back to the heart.
  2. 2. Cells that help the blood clot.
  3. 3. Muscle that helps us breathe, located under the lungs.
  4. 4. Liquid that carries oxygen and nutrients.
  5. 5. Tiny branches of tubes connecting the bronchi to the alveoli.
  6. 6. Tubes that branch off the trachea.