(a(i))[2]
State the names of structures A and B shown in Fig. 2.1.
(a(ii))[2]
State the functions of structures C and D shown in Fig. 2.1.
(b(i))[1]
State the name of the structures that make up the gas exchange surface in the lungs.
(b(ii))[1]
State the name of the gas excreted by the lungs.
(c(i))[2]
Identify the order of parts of the body that urea passes through during excretion. Write the letters from Table 2.1 in the correct order, in the boxes provided. One has been done for you.
(c(ii))[2]
State the names of two other substances that are removed by the kidneys.