The respiratory system is made up of organs that help us breathe.


The air enters our lungs through the nostrils or the mouth.
The nostrils are the two external openings of the nose.
Through the nostrils we breathe, smell, and sneeze.


We breathe in (inhale) oxygen.
We breathe out (exhale) carbon dioxide.


The lungs get bigger when we breathe in (inhale).
The lungs get smaller when we breathe out (exhale).


The diaphragm is a strong muscle below the lungs.
It contracts when we breathe in to allow our lungs to fill with air.
It relaxes when we breathe out.


The pharynx opens and the air goes down a tube called the trachea.


The air then travels down two tubes called bronchi and enters the lungs.
The lungs take in the oxygen to be carried all over your body.


The oxygen from the air passes from the lungs into our blood.


Carbon dioxide passes from our blood into the lungs.
When we breath out, the carbon dioxide leaves our lungs.

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by Happy Learning English

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