GENERAL HISTOLOGY

Detailed explanation-1: -Each terminal bronchiole branches into two respiratory bronchioles which in turn lead into several smaller alveolar ducts, from which the blind-ended alveolar sacs branch. Gas exchange is possible in respiratory bronchioles and alveolar ducts, but mainly occurs in the alveoli.

Detailed explanation-2: -In your lungs, the main airways, called bronchi, branch off into smaller and smaller passageways. The smallest airways, called bronchioles, lead to tiny air sacs called alveoli.

Detailed explanation-3: -The terminal bronchioles are the most distal segment of the conducting zone. They branch off the lesser bronchioles. Each of the terminal bronchioles divides to form respiratory bronchioles which contain a small number of alveoli.

Detailed explanation-4: -The terminal bronchioles divide further to form several generations of respiratory bronchioles, which are the narrowest airways in the lungs that give rise to alveolar ducts and alveolar sacs (respiratory bronchioles and alveoli form the respiratory zone).

Detailed explanation-5: -The lobar bronchi, which pass into a section (lobe) of your lungs. The segmental bronchi, which pass through a segment of each lobe.