A student was asked to describe the differences between four microscope slides of sections taken from different parts of the gas exchange system.
slide 1 not present: cartilage, glands present: few goblet cells, ciliated epithelial cells, smooth muscle
slide 2 present: incomplete cartilage rings, glands, goblet cells, ciliated epithelial cells, smooth muscle
slide 3 not present: cartilage, glands, goblet cells, smooth muscle present: squamous epithelial cells
slide 4 present: plates of cartilage, glands, goblet cells, ciliated epithelial cells, smooth muscle
Which is the correct identification of the parts of the gas exchange system?

1 )
A
2 )
B
C
4 )
D
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