Across
- 4. Movement of air into and out of lungs to take in oxygen and eliminate carbon dioxide in
- 5. A flap of tissue that keeps food and liquids from entering the airways.
- 6. A tube-like passageway at the top of the throat for air, food, and liquids.
- 8. Hairlike structures that collect dust and irritants.
- 10. Two thick folds of tissue (vocal cords) that vibrate to make sound.
- 11. The balance maintained when the muscular and respiratory systems interact.
Down
- 1. Microscopic sacs where gas exchange occurs; they look like a bunch of grapes.
- 2. A tube held open by C-shaped rings of cartilage.
- 3. Two narrower tubes that lead from the trachea into the lungs.
- 7. Large muscle below the lungs that contracts and relaxes to move air.
- 9. The main organs of the respiratory system.