D3.3.1—Homeostasis definition
Homeostasis maintains internal conditions within narrow limits, including blood pH, water balance, blood glucose and body temperature in human physiology.
- Syllabus
- First assessment 2025
- Objective
- D3.3.1
- Level
- SL
Exam analysis
Chance of appearing4%of analysed past papers
Latest appearanceNovember 2025
Most common paperPaper2
Typical marks2–4
Common command terms
- Explain
- Identify
- Outline
Recent exam appearances
November 2025Paper2 ["SL"] · TZ16(c)[ 4 ]D3.3.1—Homeostasis definition
November 2020Paper2 ["SL"] · TZ02(c)[ 2 ]D3.3.1—Homeostasis definition
May 2012Paper2 ["SL"] · TZ17(a)[ 4 ]D3.3.1—Homeostasis definition
May 2012Paper1 ["SL"] · TZ226[ 1 ]D3.3.1—Homeostasis definition
May 2011Paper2 ["SL"] · TZ26(c)[ 9 ]D3.3.1—Homeostasis definition
Practice this objective
Coverage 2011–2025 · Updated 16 Jul 2026
Concept essentials
- Homeostasis keeps internal variables within narrow limits.
- Negative feedback restores variables toward a set point.
- Blood pH, water balance, glucose and temperature are common homeostatic variables.