Question

There are microscopic air sacs called __________ located at the________ of the bronchioles.

• A. alveolar sacs
• B. end

Answer 1

Alveolar sacs:

• The two bronchi carry air from the windpipe to the lungs, one into the right lung and the other into the left.
• Inside the lungs, the bronchi are further divided and subdivided into smaller and smaller branches called bronchioles.
• Bronchioles end into microscopic air sacs called alveolar sacs.
• Each sac is a group of alveoli (singular—alveolus).
• There are millions of alveoli in each lung.
• Blood capillaries richly supply the walls of alveoli with blood.

Final answer: There are microscopic air sacs called alveolar sacs located at the end of the bronchioles.