Define the human respiratory system
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The respiratory system is the set of organs that allows a person to breathe and exchange oxygen and carbon dioxide throughout the body. An example of respiratory system is the human's nasal passages, larynx, trachea, bronchial tubes and lungs. YourDictionary definition and usage example.
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firstly oxygen get in through nose , then it passes fro trachea to balloon
like structure alvolie , which contain so many blood vessels which make blood oxygenated.
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