IB Biology HL · 2025

3.6 Integration of body systems

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HL archive · 2025 to 2026

3.6 Integration of body systems

Latest exam session: May 2026

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By year6micro-topics

Micro-topics in 3.6 Integration of body systems

In syllabus order. The ring is the share of papers each appears in. 6 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 6 micro-topics for the next sitting. Numbers are questions per year.

fewermore

Micro-topic20252026
3.6.1System integrationFrequently tested
14System integration, 2025: 14 questions11System integration, 2026: 11 questions
3.6.9Pain reflex arcs as an example of involuntary responses with skeletal muscle as the effectorRegular
3Pain reflex arcs as an example of involuntary responses with skeletal muscle as the effector, 2025: 3 questions·Pain reflex arcs as an example of involuntary responses with skeletal muscle as the effector, 2026: 0 questions
3.6.8Nerves as bundles of nerve fibres of both sensory and motor neuronsLess common
·Nerves as bundles of nerve fibres of both sensory and motor neurons, 2025: 0 questions1Nerves as bundles of nerve fibres of both sensory and motor neurons, 2026: 1 question
3.6.7Output from the cerebral hemispheres to muscles through motor neuronsLess common
·Output from the cerebral hemispheres to muscles through motor neurons, 2025: 0 questions1Output from the cerebral hemispheres to muscles through motor neurons, 2026: 1 question

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  • Frequently testedin at least a quarter of all papers, and still appearing in the last two years
  • Regularin roughly one paper in six or more
  • Less commonin fewer than one paper in fifteen

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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

Short answers about this page.

Which Biology HL 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 15 papers in this archive.

Which 3.6 Integration of body systems topic comes up most?

System integration (3.6.1): in 78% of papers, last seen May 26 P2 TZ3. Usually "Identify", worth about 2.8 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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