These bronchi further divide into scaled-down and scaled-down tubes known as bronchioles. The bronchioles in the end bring about small air sacs referred to as alveoli, wherever the actual fuel exchange happens. b(one) : the circulation and Trade of gases during the lungs or gills that is basic to respiration https://reidwodrf.blogginaway.com/38217870/getting-my-ventilation-ductwork-to-work