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

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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.

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

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

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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.

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

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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.

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

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

The respiratory system
by Happy Learning English

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