Biology 9700/22 — October/November 2018
Cambridge AS Level · AS Level Structured Questions · worked solutions for every part, with the mark scheme
Topics Cell Structure · Cell Membranes and Transport · Transport in Mammals · Gas Exchange · Transport in Plants · Enzymes · +5 more
Fig. 1.1A is a photomicrograph of healthy lung tissue.
Fig. 1.1B is a photomicrograph of lung tissue from a person with emphysema, a chronic obstructive pulmonary disease (COPD). The images are both at magnification .
Fig. 1.1
Name the structure labelled H in Fig. 1.1A.
Calculate the actual diameter of the alveolus at X–Y.
Write down the formula and use it to make your calculation.
Give your answer to the nearest whole micrometre (µm).
formula
actual size = ______
Gas exchange in the lungs occurs in the alveoli.
Describe the process of gas exchange in healthy lungs and suggest how this compares with gas exchange in the diseased lung shown in Fig. 1.1B.
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