Yes, an adult can have a small trachea.
You are thinking of the trachea, or windpipe, though it is not entirely made of cartilage.
trachea
The Trachea is commonly referred to as the windpipe
They are to keep the trachea patent (open) even with low intratracheal air pressures
double
its that the pharynx is big while the trachea is small :-)
The average diameter of the adult windpipe (or trachea) is 2.5cm (1 inch).
its that pharynx is big and while trachea is small
What keeps the trachea open are small cartilage ring, called cricoid cartilage.
bronchi
Most insects have small holes in the exoskeleton that is called the trachea. Oxygen is delivered directly to the insects tissues via the trachea.
glottus
The ring of cricoid cartilage
The cilia inside the trachea traps the small particles, then it is shot up the trachea to the esephogus to get destroyed by the stomach.
An adult small intestine is close to 22 feet long.
The trachea.
They are known as "cilia"