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C2.2.15 (HL)—Pain perception

Pain perception depends on sensory neurons, spinal pathways and brain interpretation, with modulation possible at synapses and higher centres, linking cellular mechanisms to rapid communication in nervous systems.

Syllabus
First assessment 2025
Objective
C2.2.15
Level
HL

Concept essentials

  • Nociceptors detect damaging or potentially damaging stimuli.
  • Sensory neurons carry pain signals toward the central nervous system.
  • Synapses can modulate pain signalling before conscious perception.
  • Pain perception requires interpretation by the brain.
ConceptIB Biology HL