Respiratory System

123456789101112131415
Across
  1. 5. Floor of the thoracic cavity
  2. 8. Also called windpipe
  3. 10. Depression where blood vessels and nerves enter and leave the lung
  4. 11. Required for cellular respiration, needed to live
  5. 13. Diffuses in from the blood to the alveoli as oxygen diffuses out
  6. 14. Large paired organs that occupy the thoracic cavity
  7. 15. Air flows into this, this divides until air reaches the alveoli
Down
  1. 1. The opening into the larynx, flap of tissue
  2. 2. The middle part of the thoracic cavity
  3. 3. Openings into the nose
  4. 4. The trachea is supported by a ring of this word
  5. 6. Each lung is covered by this membrane
  6. 7. Cluster of microscopic air sacs
  7. 9. Superior part of the pharynx
  8. 12. Known as the voice box