(a)[1]
Place an X on the septum in Fig. 3.1.
(b)[2]
Explain why the walls at B and C in Fig. 3.1 are not the same thickness.
(c)[6]
Explain how the red blood cell is transported from the vena cava to the aorta.
(d(i))[1]
Suggest how the athlete could monitor the activity of her heart.
(d(ii))[3]
Calculate the percentage change in heart rate from the highest heart rate reached during the race until the heart rate recorded at 18 minutes. Give your answer to three significant figures. Space for working.
(d(iii))[3]
Explain why heart rate has to rise during exercise.