The table shows energy transfers for a resting person over one minute in cool surroundings.
Table
| Energy transfer | Energy in kJ\mathrm{kJ}kJ |
|---|---|
| Heat released inside the body | 12 |
| Heat lost by sweat evaporation | 4 |
| Heat lost by all other routes | 5 |
Assume there are no other heat gains or losses. Which statement correctly links the energy balance to a response that could restore balance?
The body loses 3 kJ3\ \mathrm{kJ}3 kJ overall, so vasodilation could reduce heat loss.
The body gains 3 kJ3\ \mathrm{kJ}3 kJ overall, so vasodilation could increase heat loss.
The body gains 3 kJ3\ \mathrm{kJ}3 kJ overall, so vasoconstriction could increase heat loss.
The body loses 3 kJ3\ \mathrm{kJ}3 kJ overall, so vasoconstriction could reduce heat loss.
44 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.