IB Biology SL · 2025

3.6 Integration of body systems

17 past paper questions from 10 papers across 4 exam sessions. See what repeats, then practise the same skills with AI marking.

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SL archive · 2025 to 2026

3.6 Integration of body systems

Latest exam session: May 2026

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By year10micro-topics

Micro-topics in 3.6 Integration of body systems

In syllabus order. The ring is the share of papers each appears in. 2 of them have no matching questions in this archive.

Exam pattern

How often each micro-topic has been examined, year by year. Each label is explained under the grid.

Does it repeat?

Top 4 of 10 micro-topics for the next sitting. Numbers are questions per year.

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Micro-topic20252026
3.6.9Pain reflex arcs as an example of involuntary responses with skeletal muscle as the effector
3Pain reflex arcs as an example of involuntary responses with skeletal muscle as the effector, 2025: 3 questions1Pain reflex arcs as an example of involuntary responses with skeletal muscle as the effector, 2026: 1 question
3.6.14Feedback control of heart rate following sensory input from baroreceptors and chemoreceptors
·Feedback control of heart rate following sensory input from baroreceptors and chemoreceptors, 2025: 0 questions2Feedback control of heart rate following sensory input from baroreceptors and chemoreceptors, 2026: 2 questions
3.6.1System integration
·System integration, 2025: 0 questions2System integration, 2026: 2 questions
3.6.3Integration of organs in animal bodies by hormonal and nervous signalling and by transport of materials and energy
2Integration of organs in animal bodies by hormonal and nervous signalling and by transport of materials and energy, 2025: 2 questions·Integration of organs in animal bodies by hormonal and nervous signalling and by transport of materials and energy, 2026: 0 questions

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Questions on 3.6 Integration of body systems, by exam session

Which papers asked about 3.6 Integration of body systems, and which question numbers. Open a paper to see them highlighted.

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Frequently asked questions

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Which Biology SL exam sessions are covered for 3.6 Integration of body systems?

4 exam sessions from 2025 to 2026, the latest May 2026. Every Paper 1 and 2 in every timezone is read and classified in full, which gives 10 papers in this archive.

Which 3.6 Integration of body systems topic comes up most?

Pain reflex arcs as an example of involuntary responses with skeletal muscle as the effector (3.6.9): in 22% of papers, last seen May 26 P1 TZ1. Usually "Identify", worth about 1.5 marks in a paper that includes it.

Can I see the original question and mark scheme?

No. The wording belongs to the IB. You get the citation, the marks, the command term and the skill tested, plus our own matched practice questions with worked answers and AI marking.

What do "banker", "due" and "rising" mean?

Banker: examined in at least one sitting in four and still appearing. Due: regular before, but absent for the last two exam sessions. Rising: clearly more common in the last two years. Our classification of real papers, not an IB statistic.

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