A-LevelBiologyTransport in mammals9700/12 · Feb/Mar 2017 · Q341 Mark
As blood flows from an artery to a vein, the thickness of the walls of the vessels changes. Which bar chart shows these changes correctly? [Figure 34.1]
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AGraph A: Arterial wall thickness decreases significantly from artery to arteriole, then venule, then vein, with capillary being thinnest
BGraph B: Arterial wall thickness decreases slightly from artery to vein, then more for arteriole, then venule, with capillary being thinnest
CGraph C: Arterial wall thickness is moderate for artery, then decreases for arteriole, venule, and capillary, with vein being moderate
DGraph D: Arterial wall thickness is highest for artery, then vein, then arteriole, then venule, with capillary being thinnest
✓ Correct answer
D: Graph D: Arterial wall thickness is highest for artery, then vein, then arteriole, then venule, with capillary being thinnest
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