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The Respiratory System for kids

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Respiration in humans is a process which helps them to take in Oxygen and expelling carbon dioxide.Oxygen is necessary for converting food into energy.It also helps in breathing out carbon-dioxide which is produced as a result of various chemical reactions inside the human body.Respiration is also known as breathing in simple terms. The primary organs of respiratory system are nose,lungs, trachea (wind pipe) and diaphragm.All these organs function together for smooth inflow and outflow of the air