Across
- 1. Tobacco smoke contains carbon monoxide. What problem does this cause?
- 7. During exercise, what happens to breathing in humans?
- 8. What are the tiny air sacs in the lungs called?
- 10. two structures does the trachea lead to in lungs?
Down
- 2. What happens when we exhale (breathe out)?
- 3. What happens during gas exchange in the lungs?
- 4. what do we inhale?
- 5. what happens when we are at rest to our heart rate?
- 6. what is the other name for wind pipe?
- 9. When we inhale (breathe in), what happens to the pressure in the thorax?