C1.1.12 (HL)—Heat generation
Exergonic metabolic reactions release some energy as heat, helping endotherms maintain body temperature in cold environments and small bodies during survival.
- Syllabus
- First assessment 2025
- Objective
- C1.1.12
- Level
- HL
Exam analysis
Chance of appearing1%of analysed past papers
Latest appearanceNovember 2025
Most common paperPaper2
Typical marks2
Common command terms
- Explain
Recent exam appearances
November 2025Paper2 ["HL"] · TZ11(g)[ 2 ]C1.1.12 (HL)—Heat generation
November 2025Paper2 ["HL"] · TZ11(f)[ 2 ]C1.1.12 (HL)—Heat generation
Practice this objective
Coverage 2025–2025 · Updated 15 Jul 2026
Concept essentials
- Metabolic reactions release some energy as heat.
- Endotherms use metabolic heat to help maintain body temperature.
- Cold environments increase heat loss and can raise metabolic demand.
- Large mammals lose proportionally less heat because of lower surface area to volume ratio.