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Lung:
The lung is made of a sponge (Don't even think spongebob) like material. The lungs expand when you breath in, and contract when you breath out. The spong like material is a tissue. The walls of the lungs are very thin and damage very easily. They protect your "Tree".
There is an image on the left of the lung and what is on the inside. On the inside, the tree (bronchus, bronchiole, and alveoli) is connecting the larynx to the lungs.
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