The Alveoli Are a Major Structure in the Respiratory System

Multiple Choice

The alveoli are a major structure in the respiratory system. What is it's function?

A) Filters and moistens air entering the body
B) Connects the larynx to the bronchi as a flow system of incoming air
C) Small sacs that promote gas exchange with the blood in the pulmonary capillaries
D) Connects the nasal cavities to the larynx