MICROANATOMY

Detailed explanation-1: -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-2: -Terminal Bronchioles. This is the last part of the conducting portion of the respiratory system, and has the smallest diameter of all (less than 1mm).

Detailed explanation-3: -The structures in order from largest to smallest is B. Bronchi, bronchioles, terminal bronchioles, respiratory bronchioles, alveoli. Air moves through these airways in this order during inhalation to reach the alveoli, where oxygen participates in gas exchange with the blood.

Detailed explanation-4: -The amount of cartilage in the walls of the bronchi gradually decreases and disappears after the point where the bronchi divide into smaller airways called bronchioles.

Detailed explanation-5: -The right main bronchus is wider and shorter than the left main bronchus. The right main bronchus subdivides into three lobar bronchi and the left main bronchus divides into two.