| 1. The thorax contains two major organs, the lungs and
the
? |
| 2. When we breathe in the ribs
?
and the diaphragm ?
|
| 3. When we exercise we breathe faster and ?
than when we are resting. |
| 4. The trachea has rings of ?
around it to stop it from collapsing. |
| 5. The trachea divides into two ?
to take air in and out of each lung. |
| 6. The lungs are full of microscopic air sacs called ?
and microscopic blood vessels called ?
|
| 7. The air that we breathe in contains more ?
than the air that we breathe out. |
| 8. The air that we breathe out contains more ?
and ?
than the air that we breathe in. |
| 9. The gases ?
and carbon dioxide are transported around the body in the ?
|
| 10. The gas carbon dioxide is produced all over our bodies
by the process called ?
|
| 11. To prevent dust from entering the lungs the ?
has hairs and mucus to trap the large dust particles. |
| 12. The trachea is also covered in mucus which traps fine
dust particles. This mucus is swept up to the mouth by microscopic hairs
called ?
|
| 13. So that the food and drink does not pass into the
trachea when we swallow, the entrance to the trachea is protected by
the ?
|
| 14. When a person smokes a cigarette he breathes in
chemicals such as ?
which can damage the lungs. |
| 15. The exhaust gases of motor cars contain ?
which
combines with the
? to prevent it from carrying oxygen. |
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