What is the function do the a alveoli perform?

Answer 1

The alveoli are tiny air sacs in the lungs that have several functions:

1. Gas exchange: The primary function of alveoli is to facilitate the exchange of oxygen and carbon dioxide between the lungs and the bloodstream. Oxygen from inhaled air diffuses across the alveoli walls into the capillaries, while carbon dioxide from the bloodstream diffuses into the alveoli to be exhaled.

2. Increase surface area: The large number of alveoli in the lungs provides a large surface area for gas exchange. This increased surface area allows for a higher rate of oxygen uptake and carbon dioxide removal.

3. Moistening the air: The alveoli are lined with a thin layer of moisture, which helps to humidify the air and prevent the lungs from becoming too dry.

4. Defense mechanism: Alveoli also play a role in the immune system. They contain immune cells called macrophages, which help to engulf and eliminate foreign particles, such as dust and bacteria, that may enter the lungs during breathing.

Overall, the alveoli's main function is to ensure efficient gas exchange, allowing oxygen to enter the bloodstream and carbon dioxide to be removed from the body.