Across
- 3. gas that is transported by red blood cells to the whole body
- 6. also known as the s back of the throat
- 7. tube connects the nose to the lungs
- 8. where gaseous exchange takes place
- 11. where air enters the body
- 12. traps dust and germs
Down
- 1. small branches in the lungs
- 2. branch into smaller bronchioles
- 4. contracts upon inhaling
- 5. carbon dioxide is a _________ gas
- 9. main organs of the respiratory system
- 10. where vocal cords are found producing sound
- 13. blood vessels surrounding the alveoli