A-LevelBiologyTransport in mammalsMay/June 2024Paper 2 Q213 Marks
Fig. 2.1 is a diagram of the circulation in a mammal. [Figure 2.1] Fig. 2.2 is a transmission electron micrograph of a cross-section of an arteriole. Blood flows from muscular arteries through arterioles into capillary networks. The lining of the arteriole is folded because the arteriole has constricted. This constriction causes the blood pressure to decrease from 12.7 kPa in the muscular artery to 2.7 kPa at the end of the arteriole. [Figure 2.2]
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