Fig. 1 shows the structure of the human gas exchange system.
Fig 1
Identify structures V, W, and X in Fig. 1.
For Fig. 1:
Identify one tissue type that is present in structures V, W, and X but not in structure Y.
[1]
(ii)
Explain the function of the tissue identified in part (i).
[2]
Fig. 2 is an image of a micrograph showing a cross section through structure Y.
Fig. 2
Explain one structural adaptation visible in Fig. 2.
Identify and explain one other feature of structure Y that assists its function.
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