The substance that prevents the sacs at the ends of the bronchioles from collapsing is:
A) atelectasis.
B) mucus.
C) cilia.
D) surfactant.

Question

Quizplus · Accepted Answer

Surfactant is the substance that prevents the sacs at the ends of the bronchioles from collapsing. Atelectasis is a collapse of lung tissue, mucus is a sticky secretion produced by cells in the respiratory system, and cilia are hair-like projections that help move mucus and foreign particles out of the respiratory system.

The Substance That Prevents the Sacs at the Ends of the Bronchioles