GradeGen

A tiny air sac in the lungs where gases are exchanged between air and blood.

A tiny air sac in a mammalian lung where gases are exchanged between air and blood.

A tiny air sac in the lungs where oxygen and carbon dioxide diffuse between air and blood.

Each alveolus is surrounded by tiny blood vessels called capillaries. Gas exchange occurs across the alveolar wall and the capillary wall.

A tiny air sac in the lungs where gases are exchanged between air and blood.

A tiny air sac in a mammalian lung where gases are exchanged between air and blood.

A tiny air sac in the lungs where oxygen and carbon dioxide diffuse between air and blood.

Each alveolus is surrounded by tiny blood vessels called capillaries. Gas exchange occurs across the alveolar wall and the capillary wall.

Alveolus