O-LevelBiologyCoordination & Response5090/22 · Oct/Nov 2020 · Q610 Marks
The diagram shows a vertical section through human skin in a hot environment. [Figure 6.1: Diagram of human skin with labels P pointing to a sweat gland and Q pointing to a capillary/blood vessel.]
- (a)Name and outline the role of P and Q in the control of body temperature when a person is in a hot environment. P Q[7]
- (b)Explain how the process of temperature control in humans is an example of: homeostasis negative feedback.[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.
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2020). The mark or mark type is shown in brackets.
- [1] removal/loss of + heat ;
- [1] sweat gland;
- [1] produce / release + sweat ;
- [1] evaporates / vapour;
- [1] capillary;
- [1] increased AW + blood flow ;
- [1] blood near + surface AW ;
- [1] constant/same + internal environment AW / temperature;
- [1] change / increase / decrease ;
- [1] correction / reversal / back (e.g. down / up / to normal) AW ;
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