The diagram shows the arrangement of major blood vessels in the human circulatory system. Arrows show the direction that blood moves in each vessel. [Figure 2.1]

1. (a)Seven of the blood vessels have been labelled on the diagram using the letters A to G. Complete the table by writing one letter, A to G, for each name or description of a blood vessel. The first row has been completed for you. name or description blood vessel the aorta B carries blood containing the lowest concentration of urea one vessel that carries oxygenated blood carries blood at the highest pressure carries blood containing the highest concentration of glucose the hepatic vein an artery that carries deoxygenated blood [6][6]
2. (b)Explain why the movement of blood through the circulatory system of a human is described as a double circulation. [3][3]

This question uses a diagram from the original paper, which isn't shown here. Open the full paper from the past papers archive to see it.