What is a alvcoli?

Answer 1

Alveoli are tiny air sacs located in the lungs where gas exchange occurs. They are the endpoint of the respiratory tree and are responsible for exchanging oxygen and carbon dioxide between the air and the bloodstream. The walls of alveoli are extremely thin and are surrounded by capillaries, allowing for efficient diffusion of gases. Each lung contains millions of alveoli, significantly increasing the surface area for respiration.