Across
- 1. The voice box located at the top of the trachea
- 4. The protective covering of the lungs
- 7. The flap that covers the windpipe during swallowing to prevent food from entering the airway
- 8. Small tubes that branch off the bronchi in the lungs
- 10. The windpipe that connects the throat to the lungs
Down
- 2. The process of inhaling oxygen and exhaling carbon dioxide
- 3. Tiny air sacs in the lungs where gas exchange occurs
- 5. The primary muscle used in breathing, located below the lungs Has a tr Large marsupial
- 6. The organ where oxygen enters the bloodstream
- 9. A gas we inhale that is essential for life