The Respiratory System is a system about breathing in oxygen and breathing out carbon dioxide. Some of the parts in the respiratory system are nose, mouth, tracheae, bronchi and lungs. The air taken in of through the nose passes through the bronchi into bronchioles that line the entire surface of the lungs. Oxygen from the air diffuses into the blood and carbon dioxide from the blood diffuses out. Any obstruction in the air passage leads to a response by the body such as sneezing or coughing. So now go ahead and read about the respiratory system!
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