I belive it's a mixture of cartilage and lung tissue containing cila.
To increase surface area for gas exchange.
A bronchiole has no cartilage in its wall, a bronchus does.
Bronchiole is the medical term meaning small bronchi
The parts are the Trachea,Bronchiole,Bronchiole Tubes, Bronchi, and the air sacs.
Bronchiole walls are lined with a layer of cells but are not necessarily considered slippery. The lining may have some degree of moisture to aid in the movement of air, but it is not a membrane designed to be slippery.
hole, mole,
A air sac
the cateye
Alveoli.
innermost chamber of respiratory system into which air can be drawn is . Bronchiole
small
terminal brobchiole is formed as a result of division of respiratory bronchiole. It is extremely thin and end up into alveolar sac ALVEOLAR SAC THESE ARE SMALL SACS WITH 8 TO 10 SACCULES CALLES ALVEOLI. IT HAS CENTRAL AIR PASSAGE. THESE ALVEOLI SERVE AS RESPIRATORY MEMBRANE AND HELP IN EXCHANGE OF GASES