Final answer:
The statement is false; bronchioles terminate in respiratory bronchioles, not directly in alveolar sacs. The respiratory bronchioles lead into alveolar ducts, and then to the alveolar sacs containing the alveoli where gas exchange occurs.
Step-by-step explanation:
The statement that bronchioles directly terminate in the alveolar sacs is false. The correct sequence of the airways in the human respiratory system is that the terminal bronchioles subdivide into microscopic branches called respiratory bronchioles. These then lead into alveolar ducts, and finally, the alveolar ducts are connected to alveolar sacs.
It is within the alveolar sacs that the alveoli are found. These alveoli are small, balloon-like structures where gas exchange occurs between the lungs and the blood. Each alveolar sac resembles a cluster of grapes, and each sac contains numerous alveoli.
This structure is highly adapted for its role in gas exchange, as alveoli provide a large surface area and are surrounded by a dense network of capillaries.