Respiration

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Across
  1. 2. Dome-shaped muscle that contracts during inhalation.
  2. 6. The process by which oxygen moves into the blood.
  3. 7. Muscle movement that increases chest volume during inhalation.
  4. 8. Windpipe that carries air to the lungs.
  5. 10. Tiny blood vessels surrounding the alveoli.
  6. 11. In Plants gaseous exchange occurs through
  7. 13. Tiny air sacs where gaseous exchange takes place.
Down
  1. 1. Waste gas removed from the body during exhalation.
  2. 3. Two branches that carry air into each lung.
  3. 4. Microscopic powerhouse where aerobic respiration occurs.
  4. 5. Pair of organs where breathing occurs.
  5. 9. Tiny hair-like structures that trap dust in the airways.
  6. 12. Gas required by cells for aerobic respiration.