What function do alveoli serve in the respiratory system?

Alveoli are tiny, sac-like structures located in the lungs and play a crucial role in the respiratory system by facilitating gas exchange. The primary function of alveoli is to allow oxygen to enter the bloodstream and carbon dioxide to be removed from it.

With a vast surface area, the alveoli are surrounded by a network of capillaries, which are tiny blood vessels. When air is inhaled into the lungs, oxygen from the air passes through the thin walls of the alveoli into the blood in the capillaries. At the same time, carbon dioxide from the blood transfers into the alveoli to be exhaled. This exchange of gases is vital for maintaining the body’s oxygen levels and removing the waste product, carbon dioxide, which is crucial for repiratory function.

The other functions listed, such as warming air, filtering dust particles, or producing mucus, are carried out by other components of the respiratory system, such as the nasal passages and airways. These processes are important for preparing the air before it reaches the alveoli but do not directly involve the function of gas exchange that is unique to the alveoli.