<prompt> Conducting zone of the respiratory system is:1st generation of airways0th generation to 16th generation of airways0th generation to 23rd generation of airways16th to 23rd generation of airways  <response>: Of the 23 generations, trachea is considered as 0th generation, and trachea and first 16 generations are called conducting zone. Last 7 generations are called respiratory zone; gas exchange occurs in these generations. The gas exchange areas include respiratory bronchioles and alveoli. 