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1. The thorax contains two major organs, the lungs and the ? |
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2. When we breathe in the ribs ? and the diaphragm ? |
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3. When we exercise we breathe faster and ? than when we are resting. |
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4. The trachea has rings of ? around it to stop it from collapsing. |
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5. The trachea divides into two ? to take air in and out of each lung. |
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6. The lungs are full of microscopic air sacs called ?
and microscopic blood vessels called ? |
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7. The air that we breathe in contains more ? than the air that we breathe out. |
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8. The air that we breathe out contains more ?
and ? than the air that we breathe in. |
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9. The gases ?
and carbon dioxide are transported around the body in the ?
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10. The gas carbon dioxide is produced all over our bodies by the process called ? |
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11. To prevent dust from entering the lungs the ? has hairs and mucus to trap the large dust particles. |
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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 ? |
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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 ? |
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14. When a person smokes a cigarette he breathes in
chemicals such as ? which can damage the lungs. |
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15. The exhaust gases of motor cars contain ? which
combines with the ? to prevent it from carrying oxygen. |
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