(a)[2]
Calculate the actual diameter of the alveolus along X-Y. Show your working and give your answer to the nearest micrometre.
(b(i))[2]
Describe what elastic fibres do in the wall of the alveolus.
(b(ii))[4]
With reference to Fig. 2.1, explain how alveoli are suited to gas exchange.
(c(i))[2]
Chronic obstructive pulmonary disease (COPD) is a progressive illness that develops in many smokers. COPD includes two conditions: chronic bronchitis and emphysema. State two ways in which the lung tissue of a person with emphysema differs from the lung tissue of a person with healthy lungs.
(c(ii))[2]
State two symptoms of emphysema.