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RESPIRATORY SYSTEM
We breathe in oxygen and breathe out carbon
dioxide.
The respiratory system is made up by the
nostrils, the windpipe, the bronchi and the lungs.
nostrils windpipe bronchi lungs
The nose has two holes called nostrils.
nostrils
The windpipe is a tube.
This tube is divided into small tubes called bronchi.
windpipe
bronchi
The air goes down the windpipe into the lungs.
The lungs are two sacks that are protected by
the ribs.
ribs
The oxygen passes from the air to the blood.
oxygen
Carbon dioxide passes from the blood to the air.
carbon
dioxide

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