Aveoli / Aveolar, Bronchiole

source: http://www.european-lung-foundation.org/index.php?id=156

An alveolus (plural: alveoli, from Latin alveolus, "little cavity") is an anatomical structure that has the form of a hollow cavity.[1] Found in the lung parenchyma, the pulmonary alveoli are the dead ends of the respiratory tree, which outcrop from either alveolar sacs or alveolar ducts, which are both sites of gas exchange with the blood as well.[2] Alveoli are particular to mammalian lungs. Different structures are involved in gas exchange in other vertebrates.[3] The alveolar membrane is the gas-exchange surface. The blood brings carbon dioxide from the rest of the body for release into the alveoli, and the oxygen in the alveoli is taken up by the blood in the alveolar blood vessels, to be transported to all the cells in the body.
source: http://en.wikipedia.org/wiki/Pulmonary_alveolus

source: http://academic.kellogg.edu/herbrandsonc/bio201_mckinley/Respiratory%20System.htm

source: http://www.lab.anhb.uwa.edu.au/mb140/CorePages/Respiratory/respir.htm
source: http://www.keywordpicture.com/keyword/alveoli%20histology/
The bronchioles or bronchioli are the first airway branches that no longer contain cartilage. They are branches of the bronchi. The bronchioles terminate by entering the circular sacs called alveoli.
source: http://en.wikipedia.org/wiki/Bronchiole

source: http://beautiful-views.com/alveoli.html

source: http://www.nlm.nih.gov/medlineplus/ency/imagepages/19346.htm

source: http://www.siumed.edu/~dking2/crr/CR016b.htm
source: http://www.h2owtt.com/wttpage51-2.html

source: http://www.youtube.com/watch?v=bwXvqSqAgKc&feature=BF&list=QL&index=1

source: http://www.youtube.com/watch?v=HiT621PrrO0&feature=BF&list=QL&index=2

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