Figure 1 below shows the cross section of an artery.
Figure 1
Identify the region marked X on Figure 1.
Explain how the endothelium layer of the artery in part (a) in Figure 1 is adapted for the transport of blood.
Table 1 below shows the relative thickness of layers in the wall of an artery and a vein.
Table 1
Layer in wall |
Thickness / µm | |
Artery | Vein | |
Endothelium | 25 | 25 |
Smooth muscle | 495 | 245 |
Elastic tissue | 375 | 245 |
Connective tissue | 125 | 125 |
Explain the function of the elastic tissue in the wall of an artery.
Use Table 1 to calculate the ratio of the total thickness of an artery wall to the total thickness of a vein wall. Your answer should be expressed as __ : 1.
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