Question

filling the blanks the small air sacs in the lungs are called________​

Answer 1

Answer:

The tiny air sacs of the lungs, made of single layer of squamous epithelium, which allow for rapid gaseous exchange is called alveolus. Its plural is alveoli. Hence, Option A is correct.

Answer 2

Answer:

Tiny air sacs at the end of the bronchioles (tiny branches of air tubes in the lungs). The alveoli are where the lungs and the blood exchange oxygen and carbon dioxide during the process of breathing in and breathing out.