MCQ IN MEDICINE

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: -The right mainstem bronchus divides into the right upper lobe bronchus and the bronchus intermedius (BI). The former then divides into 3 segments: apical (RB1), posterior (RB2), and anterior (RB3). The bronchus intermedius divides into the right middle lobe and right lower lobe bronchi.

Detailed explanation-3: -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-4: -Segmental bronchi continue their branching until they reach the final, sixt generation of bronchi. Every generation, starting from primary, is supported by cartilage in its wall. After sixth generation, the passageways are too narrow to be supported by the cartillage, and thus are called bronchioles (small bronchi).