THORAX ABDOMEN AND PELVIS

Detailed explanation-1: -As they enter the lungs these primary bronchi branch into secondary bronchi known as lobar bronchi which supply each lobe of the lung. These in turn give rise to tertiary bronchi (tertiary meaning “third"), known as segmental bronchi which supply each bronchopulmonary segment.

Detailed explanation-2: -The terminal bronchiole is the smallest conducting airway without alveoli in its walls. There are about 30, 000 terminal bronchioles in the lungs, and each of these, in turn, directs air to approximately 10, 000 alveoli. The cells that line the airways are columnar in shape and ciliated.

Detailed explanation-3: -Bronchioles open into short segments called terminal bronchioles, which are thin-walled branches of the bronchioles. Terminal bronchioles transition into respiratory bronchioles. Respiratory bronchioles are lined by two types of epithelial cells: ciliated columnar cells and club cells (also known as Clara cells).