alveoli are the little sacks in the lungs which expand to allow air in. they are very thin to allow gaseous exchanges to occur =)
Alveoli (pulmonis) or just alveoli.
A spot on the lung tissue can be caused by scarring or from a benign tumor. It can, but does not always mean lung cancer. Asking your physician is the best course of action.
The tiny sacs insure that the maximum area of tissue can be in close contact with the blood vessels to facilitate gas transfer
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.
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.
Lung tissue would typically sink in water because it is denser than water. The air sacs in the lung would collapse and the tissue would be more solid, leading to sinking rather than floating.
Yes, the aveloar sacs have not been inflated w/ air as the pig has never taken a breath. Niki C
For oxygen exchange
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
The tissue of the sacs of the lungs has potential of regenerative growth of up to 80% of damaged tissue. Grape seed extract adds up to 80% of regenerative growth capability of damaged lung sac tissue.