Respiratory and Circulatory Systems Crossword

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Across
  1. 1. The muscular wall that divides the heart into the right and left chambers.
  2. 3. Structures that open and close to prevent blood from flowing backward in the heart.
  3. 5. Smaller branches of the bronchi within the lungs.
  4. 6. The structure that houses the vocal cords and facilitates voice production.
  5. 10. The windpipe.
  6. 12. Another entry and exit point for air. Does not filter the air.
  7. 14. A flap of tissue that seals off the windpipe during swallowing, preventing food from entering the lungs.
  8. 15. The largest artery that carries oxygen-rich blood from the heart to the rest of the body.
  9. 16. The nose internal area; warms, moistens, and filters air.
  10. 17. The muscular organ that pumps blood through the blood vessels of the circulatory system.
Down
  1. 2. Located in the throat. Serves as a passageway for both air and food.
  2. 4. Blood vessel that carries mostly oxygen-poor blood towards the heart.
  3. 5. Large air passages that branch from the trachea into the lungs.
  4. 7. Small blood vessels where gases are exchanged between the blood and the lungs.
  5. 8. Pair of organs in the chest that are responsible for air exchange.
  6. 9. The main muscle used in the process of breathing.
  7. 11. Tiny sacs where oxygen and carbon dioxide are exchanged with the blood.
  8. 13. Blood vessel that transports mainly oxygen-rich blood away from the heart.