Across
- 1. Also known as windpipe
- 6. Air sacs are covered by a dense network of ___________
- 8. Muscles between the ribs allowing them to expand and relax
Down
- 2. Small air sacs in the lungs that help with gas exchange
- 3. Bones shaped like a cage that protect the Lungs and the Heart
- 4. A muscle that is shaped like a upside down "u"
- 5. Something that helps us speak
- 7. A major organ in the respiratory system with alveoli in it