in Breathing and Respiration (Respiratory System) by

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Conducting zone: it is a zone which conducts air and allows it to pass in and out of the lungs. This zone is made up of nose, pharynx, larynx, trachea, bronchi and bronchioles.

Respiratory zone: it is a zone where actual respiration and gas exchange takes place. This zone is made up of alveoli, alveolar ducts, and respiratory bronchioles.

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