Q: Bronchial tubes in the lungs branch into ever-smaller structures, finally ending in alveoli. the alveoli act like what?


Read this paragraph and choose the correct option from the provided answers:

Figure 11.31 Bronchial tubes in the lungs branch into ever-smaller structures, finally ending in alveoli. The alveoli act like tiny bubbles. The surface tension of their mucous lining aids in exhalation and can prevent inhalation if too great.

 Choices:

- filters

- springs

- bellows

- tiny bubbles


A:
tiny bubbles