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C3.1.7—Output through motor neurons

Output through motor neurons links named stimuli, coordinating structures and effectors so body systems or plant tissues produce an integrated biological response.

Syllabus
First assessment 2025
Objective
C3.1.7
Level
HL

Exam analysis

Chance of appearing1%of analysed past papers
Latest appearanceMay 2015
Most common paperPaper1
Typical marks1

Common command terms

  • Describe
  • Identify

Scoring notes

Common mistake
Giving a general body-system answer without the specific pathway step for motor neuron output pathway.

Recent exam appearances

May 2015Paper1 ["HL"] · TZ237[ 1 ]C3.1.7—Output through motor neurons
Practice this objective

Coverage 2015–2015 · Updated 16 Jul 2026

Concept essentials

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