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C3.1.15—Ventilation rate feedback control

Ventilation rate feedback control links named stimuli, coordinating structures and effectors so body systems or plant tissues produce an integrated biological response.

Syllabus
First assessment 2025
Objective
C3.1.15
Level
HL

Exam analysis

Chance of appearing8%of analysed past papers
Latest appearanceMay 2025
Most common paperPaper3
Typical marks1–6

Common command terms

  • Explain
  • State
  • Outline
  • Identify

Scoring notes

Common mistake
Treating low oxygen as the only trigger and omitting carbon-dioxide-driven pH change.

Recent exam appearances

May 2025Paper2 ["HL"] · TZ34(c)[ 2 ]C3.1.15—Ventilation rate feedback control
May 2025Paper2 ["HL"] · TZ34(b)[ 1 ]C3.1.15—Ventilation rate feedback control
May 2025Paper2 ["HL"] · TZ34(a)[ 1 ]C3.1.15—Ventilation rate feedback control
May 2025Paper2 ["HL"] · TZ210(c)[ 8 ]C3.1.15—Ventilation rate feedback control
May 2024Paper3 ["HL"] · TZ120(c)[ 2 ]C3.1.15—Ventilation rate feedback control
Practice this objective

Coverage 2014–2025 · Updated 16 Jul 2026

Concept essentials

  • Ventilation rate feedback control depends on linking the stimulus to the coordinating structure or signal.
  • The pathway for ventilation rate feedback control must keep information flow and response direction clear.
  • Named tissues, hormones, neurons or effectors give ventilation rate feedback control its biological specificity.
  • Evidence about ventilation rate feedback control is strongest when structure, mechanism and outcome are connected.
ConceptIB Biology HL