THE RESPIRATORY SYSTEM

THE RESPIRATORY SYSTEM

The respiratory system is made up of 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 our lungs, also through the alveoli. When we breathe out, the carbon dioxide leaves our lungs.

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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