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

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We breathe in oxygen from the air.
We breathe out carbon dioxide.

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The diaphragma (a sheet of muscle) contracts when we breathe in to allow our lungs to fill with air. The diaphragm relaxes when we breathe out.

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Our lungs get bigger when we breathe in.
Our lungs get smaller when we breathe out.

Video | The Benefits of Deep Breathing by YouBeauty. Our lungs expand to take in oxygen and contract to release carbon dioxide. We do this by expanding and contracting our diaphragm or raising and lowering our ribs to increase or decrease the content of the chest cavity.

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We breathe in air through our nose and mouth.

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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. We have two lungs.

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

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