Question

Which of the following is the main structural difference between trachea and bronchi?

• A. C-shaped cartilaginous rings
• B. Smooth muscle
• C. Mucous glands
• D. Ciliated cells

Answer 1

The correct option is A

C-shaped cartilaginous rings

Both trachea and bronchi have smooth muscles. Tiny mucous glands are present in both these structures. They are also lined by cilia, like the rest of the respiratory system. However, the chief differentiating feature is the presence of C-shaped rings of cartilage in the trachea which are irregularly shaped in the bronchi.