Air keeps moving through your airways until it reaches tiny balloon-like air sacs in your lungs called alveoli. From there, the oxygen moves into your blood. Healthy lungs carry oxygen from the ...

Acute bronchitis is a respiratory tract infection that involves two of the major airways in the lungs. It is usually caused ...

They greatly increase the surface area of the lungs. You have about 480 million alveoli, located in clusters at the end of the bronchioles. They cover a total surface area that can measure up to ...

The researchers still need to assess how much of the lungs are repaired. The study focused on the major airways rather than the small structures called alveoli, where oxygen crosses from the air ...

a: Gross anatomy of lung and thorax. b: Microscopic anatomy of bronchial wall. C: View of terminal airway and alveoli. d: Alveolar structure.