(a)[4]
Use Fig. 2.1, together with what you know about the circulatory system, to finish Table 2.1.
(b(i))[2]
Draw a line on Fig. 2.2(b) to represent how the diameters of the blood vessels change along the route of blood flow.
(b(ii))[4]
Use the line you have drawn on Fig. 2.2(b), together with your biological knowledge, to explain why the mean blood pressure is higher in an artery than in a vein.
(c(i))[2]
Name part D in Fig. 2.3 and explain how this part helps blood return to the heart.
(c(ii))[2]
Suggest how the parts labelled E in Fig. 2.3 assist blood in returning to the heart.