Unit 2.5; Respiratory system ........... Name ______________

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Across
  1. 1. A tube that carries air to and from the lungs.
  2. 4. A dome-shaped muscle below the lungs that helps with breathing.
  3. 5. A passage that carries air from the nose to the larynx.
  4. 6. A gas that the body needs to produce energy
  5. 7. Smaller branches inside the lungs.
  6. 9. Tiny air sacs in the lungs where gas exchange happens.
  7. 10. Muscles between the ribs that help expand and contract the chest.
  8. 13. breathing in
  9. 14. A sticky substance that traps dust and germs in the airways.
  10. 15. The process where oxygen enters the blood and carbon dioxide leaves it
  11. 16. Two branches from the trachea that lead into each lung.
  12. 17. Tiny hair-like structures that move mucus out of the lungs.
  13. 18. Where air enters the body; it filters, warms, and moistens the air.
Down
  1. 2. A waste gas produced by cells that must be removed from the body.
  2. 3. a soft flap of tissue that stops food from entering the trachea
  3. 8. Tiny blood vessels around alveoli where oxygen and carbon dioxide are exchanged.
  4. 11. breathing out
  5. 12. you have two; used for breathing air