The volume of air present in respiratory tract from nose upto terminal bronchioles and which is not involved in gaseous exchange is -

Step-by-step solution

The respiratory tract is divided into a conducting zone and a respiratory zone. The conducting zone extends from the external nares (nose) up to the terminal bronchioles. The air present in this part of the respiratory tract does not participate in gaseous exchange. This volume of air is known as the anatomical dead space, which is approximately 150 mL in a healthy adult. Tidal volume is the volume of air inspired or expired during normal respiration. Vital capacity is the maximum volume of air a person can breathe