Why is the branching pattern of the bronchioles important for the function of the lower respiratory system?

The bronchioles branch into many smaller airways that lead to the alveoli, creating a large surface area for gas exchange. This gives oxygen many places to pass from the air into the blood, so B is correct. Keeping particles out is mainly the job of structures such as mucus and cilia, not the branching pattern itself.

AI-written and checked against the verified answer.