A person has an area of grafted skin. The person exercises for 15 minutes in a warm room. Equal areas of normal skin and grafted skin are exposed to the same surroundings.
| Measurement after 15 minutes | Normal skin | Grafted skin |
|---|---|---|
| Mean frequency of impulses in nerves leading to the sweat glands (impulses per second) | 18 | 17 |
| Mass of sweat evaporated (g) | 1.8 | 0.2 |
| Skin temperature (∘C^\circ\mathrm{C}∘C) | 34.4 | 36.9 |
Explain what these results suggest about the part of the thermoregulatory control pathway affected in the grafted skin and predict how grafted skin covering a large proportion of the body could affect core body temperature.
78 exam-style questions on Edexcel GCSE Biology 7.3 Homeostasis and thermoregulation, covering 7.3.1 Importance of a constant internal environment, 7.3.2 Importance of homeostasis, 7.3.3a Thermoregulation via the skin and hypothalamus, and 7.3.3b Vasoconstriction and vasodilation in thermoregulation. Each one has a worked solution and a mark scheme showing where the marks go.