Concept:The human respiratory passage is organised in a specific sequence from the throat into the lungs.
Explanation:Part I is the larynx, commonly called the voice box, located below the pharynx.
Part II is the trachea, or windpipe, which extends downward from the larynx.
Part III is a bronchiole, a small airway branch found deeper inside the lung.
Part IV is a bronchus, one of the two main branches of the trachea that enter the lungs.
Therefore, the parts labelled I, II, III and IV respectively are larynx, trachea, bronchiole and bronchus.
Answer:D. larynx, trachea, bronchiole, and bronchus.
