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C3.1 Integration of body systems

Integrated body systems coordinate neural, hormonal and plant responses through receptors, control centres and effectors, maintaining function across organisms and changing environmental conditions.

Syllabus
First assessment 2025
Topic
C3.1
Level
SL

What you’ll learn

16 learning objectives

Choose one objective for a focused lesson, or study the complete topic.

Exam analysis

An aggregate view of how the complete C3.1 Integration of body systems appears across past papers.

Chance of appearing39%of analysed past papers
Latest appearanceNovember 2025
Most common paperPaper3

Most tested objectives

  1. C3.1.9—Pain reflex arcs16 questions
  2. C3.1.4—Brain as information integration organ14 questions
  3. C3.1.14—Heart rate feedback control10 questions

Common question formats

  • Structured response
  • Definition or recall
  • Diagram interpretation
  • Process explanation
  • Extended response
  • Calculation
  • Experimental design
  • Comparison
  • Data analysis
  • Graph interpretation

Exam question appearances

November 2025Paper1A ["SL"] · TZ318[ 1 ]C3.1.15—Ventilation rate feedback control
November 2025Paper1A ["SL"] · TZ116[ 1 ]C3.1.9—Pain reflex arcs
May 2025Paper2 ["SL"] · TZ38(a)[ 4 ]C3.1.13—Hypothalamus and pituitary control
May 2025Paper1B ["SL"] · TZ33(c)[ 1 ]C3.1.5—Spinal cord
May 2025Paper1A ["SL"] · TZ317[ 1 ]C3.1.16—Peristalsis control

Coverage 2010–2025 · Updated 16 Jul 2026

Study checklistC3.1 Integration of body systems