(a)[1]
The luminal surface in Fig. 5.1 is not sharply outlined and looks a little blurred. State why the luminal surface of the bronchial epithelium looks slightly blurred, even though the image resolution is good.
(b)[2]
In Fig. 5.1, some bronchial epithelial cells look darker than others. For instance, cell D is darker than cell L. With reference to the bronchial epithelium in Fig. 5.1, explain why certain cells, such as cell D, appear darker, while others, such as cell L, appear lighter.
(c)[3]
In Fig. 5.1, the tissue in box B is cartilage. The tissue in box A is not the same as the tissue in box B. Outline how the structure and function of tissue A differ from those of tissue B.