A student made some labelled drawings of lung tissue using the high-power lens of a light microscope, but did not label two airways, P and Q.
The drawing of the lining layer of P showed both ciliated cells and goblet cells, whilst the drawing of the lining layer of Q showed ciliated cells but very few goblet cells.
What are airways P and Q?

1 )
A
2 )
B
C
4 )
D
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