circulatory and respiratory system crossword

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Across
  1. 4. the lower or bottom chambers of the heart
  2. 6. carries oxygen rich blood to the left atrium of the heart
  3. 8. carry blood away from the heart
  4. 9. at the end of bronchioles by capillaries where the exchange of oxygen and carbon dioxide take place.
  5. 13. the smallest blood vessels, where the exchange of oxygen occurs in the lungs
  6. 15. passageway for air from larynx to lungs
  7. 16. 2 tubes that branches from the trachea.
Down
  1. 1. circulation-movement of blood through the tissues of the heart.
  2. 2. circulation-moves blood from the heart to the lungs and back to the heart
  3. 3. carry blood toward the heart
  4. 5. done-shaped muscle under the lungs. contracts and relaxes when you inhale and exhale.
  5. 7. smaller branches from the bronchi that lead to tiny sacs called alveoli.
  6. 10. the upper or top chambers of the heart.
  7. 11. circulation-supplies nutrients to all the tissues of the body except for the heart and lungs
  8. 12. contains vocal cords that vibrate to make sound.the epiglottis guards the entrance to lungs
  9. 14. branches into 2 tubes. the esophagus goes to the stomach and the trachea to the lungs