Which one serves as a passage for both food and air?

Select the correct option based on the number of structures in the human respiratory system:
$I$ - Trachea,$II$ - Terminal bronchioles,$III$ - Secondary bronchi,$IV$ - Tertiary bronchi

The vocal cords are attached to which of the following?

What is the function of the conducting part of the human respiratory system?

The inner surface of the larynx is lined by:

The function of tracheal hair (cilia) is to