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1º
Air enters in the body through our nostrils
2º
The nose warms the air
3º
The hairs in the nostrils cleans the air
4º
The air goes down the windpipe and the bronchi
5º
The air passes into the lungs
6º
The oxygen passes from the air into the blood
7º
The CO2 passes from the blood into the air
8º
Carbon dioxide leaves our body
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