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Alveoli.
The lungs contain air sacs called alveoli which are surrounded by blood capillaries to allow gaseous exchange.
The bronchi continue to divide into smaller and smaller branches until they end in air sacs. The air sacs in the lungs are called alveoli.
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.
air sacs
Labryinth fish have air sacs and can gulp air.
The color of your air sacs are a peach color.
Nucleus
air sacs are in the lungs and when you breathe in blood carries it to the lungs.
Oxygen moves into the capillaries from the air sacs. Carbon dioxide moves out the the capillaries into the air sacs.
No, sharks don't have air sacs. Instead they have gills.
Dubstep