(a)[3]
State what the labels A, D and E represent in Fig. 5.1.
(b)[1]
Part B in Fig. 5.1 contains specialised cells that move mucus. State the name of these specialised cells.
(c)[2]
State the letter of a part shown in Fig. 5.1 that also plays a role in digestion, and name one type of digestion occurring there.
(d(i))[2]
State one item of evidence from Fig. 5.2 that supports this statement and one item of evidence that does not support it: ‘The larger the species, the larger the total alveolar surface area.’
(d(ii))[1]
Calculate the difference in total alveolar surface area between species D and G shown in Fig. 5.2.
(e)[2]
A large surface area is one feature of human gas-exchange surfaces. State two other features.