Respiratory System

12345678
Across
  1. 2. Bones that protect the lungs
  2. 5. Tiny air sacs where the lungs and the blood exchange oxygen and carbon dioxide
  3. 6. Main organ in the respiratory system
  4. 8. Also known as "the windpipe."
Down
  1. 1. Muscle that helps people breathe
  2. 3. Tubes that go into the lungs
  3. 4. Hairs in the nose that clean the air coming in
  4. 7. The voice box that helps people speak