Across
- 4. This activity causes the participant to increase his or her breathing rate so that it take in more oxygen which is needed by the body.
- 6. , These are smaller tubes which transport air towards and away from the air sacs in the lungs.
- 8. This is the place where gas exchange takes place.
- 9. They provide large exposed surface area for gas exchange to take place efficiently.
Down
- 1. Transport air towards and away from lungs.
- 2. This body system helps to take in oxygen and remove carbon dioxide from the body.
- 3. This helps to moisten and warm the air we breathe in.
- 5. The bone structure which protects the soft and delicate lungs.
- 7. This is the action of inhalation and exhalation of air.