(a(i))[1]
Name the main metabolic waste product removed by the kidneys.
(a(ii))[1]
State how this metabolic product is produced.
(a(iii))[1]
State where this metabolic product is produced.
(b)[7]
Glomerular filtrate is produced by ultrafiltration. Describe the process of ultrafiltration.
(c)[2]
Different mammals have medullae of different thicknesses relative to kidney size. Fig. 6.1 shows how the mean thickness of the medulla in the kidneys of different mammals is related to the concentration of urine produced by the kidneys. Suggest an explanation for the relationship shown in Fig. 6.1.