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2. The walls of arteries and veins include endothelium, smooth muscle tissue and elastic tissue. The graph below shows the relative thickness of these tissues in the walls of two blood vessels with a similar diameter.     Right-click on the blue button to open Figure 2.1        

2.3 Warfarin is an anticoagulant drug that can be used to treat cardiovascular disease (CVD).    2.3.1 Explain the benefits of warfarin in the treatment of CVD. (3)

7. The complexity of the respiratory system is correlated with the size of the organism. As animal size increases, diffusion distances increase and the ratio of surface area to volume drops. Animals therefore adapted with a unique gaseous exchange and blood circulatory system.  

  TOTAL QUESTION 7 [13]

7.1 Describe how the human lung is adapted for rapid gas exchange. (5)

  TOTAL QUESTION 5 [16]

5.5 The DNA of an organism carries its genetic code. The diagram below shows part of the DNA of a gene.   C C A T T C                 Choose the correct answer indicating the mRNA produced from this DNA. (1)

1.3 The maximum pressure in the right ventricle is lower than the maximum pressure in the left ventricle. Explain the importance of this pressure difference. (2)

2.1.2 Explain the roles of each of these tissues in blood vessels. (3)

4.3 Choose the correct option to complete the following statement. The process by which glucose passes through the cell membrane is called? (1)