Alveoli (pulmonis) or just alveoli.
Alveoli
Lung tissue is alternatively called parenchyma. It is actually made up of clusters of soft, spongy air sacs known as lobules.
They are called Alveoli, look that up on wikipedia, or in your textbook.
Lung sacs are called, "Alvioli" (al-vee-OH-lee)
The tiny sacs insure that the maximum area of tissue can be in close contact with the blood vessels to facilitate gas transfer
A lot of the lung tissue can be damaged by smoking, but you seem to be asking about the alveoli (singular = alveolus). These are small sacs surrounded by blood vessels that are located at the end of the various branches of the air passageways inside the lungs.
lungs
Healthy lung tissue from an adult pig will float in formalin because there is a (relatively) large volume of air trapped in the alveolar sacs. Fetal pigs haven't taken a breath yet, so there is no air in the alveolar sacs. This is why the lung tissue from a fetal pig will sink in formalin. Incidently, this is also how medical examiners can determine if a child was stillborn or was born alive and then died - check to see if a section of lung from autopsy floats in the formalin.
Oxygen is obtained from the atmosphere by a process called Respiration, this involves inhaling air and filling small air sacs in the lung, at which point the oxgen passes into the bloodstream through a process called Diffusion.
alveoli are the little sacks in the lungs which expand to allow air in. they are very thin to allow gaseous exchanges to occur =)
It reduces the surface area because it reduces the number of alveolar sacs in a persons lungs.
In the lungs? Can you please be more specific. There are lung tissues and sacs that aid in gas exchange called alveoli, but there really isn't a specific lung cell.
The bronchus of a lung is the tubes leading up to the alveolus of the lung. The alveolus of a lung is the small air sacs at the end of the bronchi (bronchus). The alveoli is where the gas exchange of oxygen and carbon dioxide takes place.