Question

Why the diameter of trachea remain constant, even at the time when there is no air cross  through?​

Answer 1

$\large\boxed{\textsf{\textbf{\orange{ANSWER\::-}}}}$

The trachea, or windpipe, is the continuation of the airway below the larynx. The walls of the trachea (TRAY-kee-uh) are strengthened by stiff rings of cartilage to keep it open. The trachea is also lined with cilia, which sweep fluids and foreign particles out of the airway so that they stay out of the lungs.

${\underline{\textsf{ \textbf{hope it helps }.}}}$