(a(i))[2]
Describe the role of goblet cells.
(a(ii))[2]
Explain how the cell labelled X in Fig. 3.1 is adapted for its function.
(a(iii))[1]
State one other part of the body where the type of cell labelled X in Fig. 3.1 is found.
(b)[5]
Complete Table 3.1 by filling in the actions of each breathing-system feature that happen to cause inspiration.
(c)[1]
State the name of the gas excreted by the breathing system.
(d)[2]
Good ventilation is one feature of gas exchange surfaces. State two more features.
(e)[1]
State the name of the gas exchange surface in humans.