Question

which of the following best describes what alveoli are? a. they are the smallest tubes in the respiratory system. b. they have a small amount of surface area. c. they are found on the end of bronchioles. d. they are comprised of millions of cells. please select the best answer from the choices provided.

Explanation:

Alveoli are tiny air - sacs located at the end of bronchioles in the respiratory system. They have a large surface area for gas exchange and are not the smallest tubes (bronchioles are smaller in a sense of being tubes). They are not characterized by having a small surface area and are not made up of millions of cells in the way described in option D.

Answer:

C. They are found on the end of bronchioles.