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C3.1.14—Heart rate feedback control

Heart 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
C3.1.14
Level
HL

Exam analysis

Chance of appearing9%of analysed past papers
Latest appearanceNovember 2024
Most common paperPaper3
Typical marks1–3

Common command terms

  • Outline
  • Identify
  • State
  • Compare
  • Describe
  • Explain

Scoring notes

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

Recent exam appearances

November 2024Paper3 ["HL"] · TZ021(b)[ 1 ]C3.1.14—Heart rate feedback control
May 2024Paper1 ["HL"] · TZ125[ 1 ]C3.1.14—Heart rate feedback control
May 2024Paper3 ["HL"] · TZ123(c)[ 3 ]C3.1.14—Heart rate feedback control
May 2022Paper1 ["HL"] · TZ121[ 1 ]C3.1.14—Heart rate feedback control
November 2020Paper3 ["HL"] · TZ022(c)[ 2 ]C3.1.14—Heart rate feedback control
Practice this objective

Coverage 2014–2024 · Updated 16 Jul 2026

Concept essentials

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