From widest to narrowest, which of the following describes the branches of the bronchial tree?

The correct answer is the sequence that accurately reflects the hierarchical structure of the bronchial tree, which begins with the primary bronchi and narrows down to the bronchioles. The primary bronchi are the largest branches, formed as the trachea divides into two tubes that lead to each lung. From each primary bronchus, the airway splits into the secondary bronchi, which go to each lobe of the lung, and then on to the tertiary bronchi, which further divide and supply segments within the lobes.

Finally, the bronchial tree culminates in the bronchioles, which are the smallest branches and lack cartilage in their walls. This progression illustrates a clear transition from wider structures (primary bronchi) to narrower structures (bronchioles). Understanding this structure is crucial for comprehending how air is distributed throughout the lungs during respiration.