Question

Which one of the following has the smallest diameter?
(a) Trachea
(b) Secondary bronchi
(c) Respiratory bronchiole
(d) Left primary bronchus

Answer 1

The secondary bronchi has smallest. diameter

Answer 2

Respiratory bronchiole has the smallest diameter. (Option C)

- The respiratory system of the human beings is divided into many segments.

- Among all of these segments of the human respiratory system the narrowest path of air passing, is undoubtedly the bronchioles which are the divided extensions of the bronchi.

- These bronchioles have a small diameter of 0.5 mm (approximately).