EduNinja

C2.2 Neural signalling

Neural signalling transmits information through neuron structure, ion gradients, action potentials, synapses and chemical modulation of postsynaptic responses, linking cellular mechanisms to rapid communication in nervous systems.

Syllabus
First assessment 2025
Topic
C2.2
Level
SL

What you’ll learn

7 learning objectives

Choose one objective for a focused lesson, or study the complete topic.

Exam analysis

An aggregate view of how the complete C2.2 Neural signalling appears across past papers.

Chance of appearing41%of analysed past papers
Latest appearanceNovember 2025
Most common paperPaper2

Most tested objectives

  1. C2.2.12 (HL)—Exogenous chemicals16 questions
  2. C2.2.1—Neurons11 questions
  3. C2.2.5—Synapses as junctions10 questions

Common question formats

  • Calculation
  • Comparison
  • Data analysis
  • Diagram interpretation
  • Process explanation
  • Structured response
  • Definition or recall

Exam question appearances

November 2025Paper2 ["SL"] · TZ15(c)[ 1 ]C2.2.5—Synapses as junctions
November 2025Paper2 ["SL"] · TZ15(b)[ 2 ]C2.2.5—Synapses as junctions
November 2025Paper2 ["SL"] · TZ15(a)[ 1 ]C2.2.6—Neurotransmitter release
November 2025Paper1A ["SL"] · TZ111[ 1 ]C2.2.1—Neurons
May 2025Paper2 ["SL"] · TZ36(b)[ 3 ]C2.2.7—Excitatory postsynaptic potential

Coverage 2010–2025 · Updated 15 Jul 2026

Study checklistC2.2 Neural signalling