The respiratory system is made up a group of organs that help us breathe.
We breathe in oxygen and breathe out carbon dioxide.
Air enters our lungs through the nose, mouth, trachea and bronchi.
Oxygen then passes into our blood through the alveoli.
Carbon dioxide from our blood passes into lungs, also through the alveoli
The diaphragm is a strong muscle below the lungs which contracts when we breathe in and relaxes when we breathe out.
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