(a(i))[3]
State the names of the labelled parts X, Y and Z in Fig. 2.1.
(a(ii))[2]
State the name of this tissue and describe its function.
(a(iii))[2]
State the names of two types of cells that protect the breathing system from particles.
(b)[5]
Describe and explain the changes in the thorax that occur during section A only in Fig. 2.2.
(c)[3]
Complete the sentences to show the effect of carbon dioxide concentration on breathing. During physical activity, the carbon dioxide concentration in the blood [BLANK]. This is detected by [BLANK]. This results in an increased rate and a greater [BLANK].