Where does the bronchial tree begin?

Where does the bronchial tree begin?

• A. Carina
• B. Larynx
• C. Epiglottis
• D. Alveolar sac

Answer: (A)

The bronchial tree begins at the carina, the ridge where the trachea splits into the right and left main bronchi. That bifurcation marks the start of the bronchial airways as they branch into the lungs, first into the main bronchi and then into progressively smaller passages down to the bronchioles and beyond. The larynx sits above the trachea and handles voice and airway protection, while the epiglottis is part of the laryngeal region that helps prevent swallowing from entering the airway. The alveolar sacs are at the far end of the tree, where gas exchange occurs, not where the branching starts.

The bronchial tree begins at the carina, the ridge where the trachea splits into the right and left main bronchi. That bifurcation marks the start of the bronchial airways as they branch into the lungs, first into the main bronchi and then into progressively smaller passages down to the bronchioles and beyond. The larynx sits above the trachea and handles voice and airway protection, while the epiglottis is part of the laryngeal region that helps prevent swallowing from entering the airway. The alveolar sacs are at the far end of the tree, where gas exchange occurs, not where the branching starts.