C3.1.3—Integration of organs
Integration of organs links named stimuli, coordinating structures and effectors so body systems or plant tissues produce an integrated biological response.
- Syllabus
- First assessment 2025
- Objective
- C3.1.3
- Level
- SL
Exam analysis
Chance of appearing4%of analysed past papers
Latest appearanceNovember 2024
Most common paperPaper3
Typical marks1–2
Common command terms
- Identify
- Explain
- Draw
- Deduce
- Suggest
- Outline
- Describe
Scoring notes
- Common mistake
- Giving a general body-system answer without the specific pathway step for integration of organs.
Recent exam appearances
November 2024Paper3 ["SL"] · TZ16(a)[ 2 ]C3.1.3—Integration of organs
May 2024Paper3 ["SL"] · TZ16(a)[ 1 ]C3.1.3—Integration of organs
May 2017Paper3 ["SL"] · TZ119[ 2 ]C3.1.3—Integration of organs
May 2017Paper3 ["SL"] · TZ118(b)[ 3 ]C3.1.3—Integration of organs
November 2015Paper2 ["SL"] · TZ04(a)[ 2 ]C3.1.3—Integration of organs
Practice this objective
Coverage 2013–2024 · Updated 16 Jul 2026
Concept essentials
- Integration of organs depends on linking the stimulus to the coordinating structure or signal.
- The pathway for integration of organs must keep information flow and response direction clear.
- Named tissues, hormones, neurons or effectors give integration of organs its biological specificity.
- Evidence about integration of organs is strongest when structure, mechanism and outcome are connected.