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C3.2.2—Skin and mucous membranes

Skin and mucous membranes explains how a specific barrier, pathogen interaction, immune mechanism or treatment response contributes to protection against infectious disease.

Syllabus
First assessment 2025
Objective
C3.2.2
Level
HL

Exam analysis

Chance of appearing4%of analysed past papers
Latest appearanceNovember 2025
Most common paperPaper2
Typical marks1–3

Common command terms

  • State
  • Describe

Scoring notes

Common mistake
Naming symptoms without linking them to the causative pathogen or transmission route.

Recent exam appearances

November 2025Paper2 ["HL"] · TZ32(a)[ 2 ]C3.2.2—Skin and mucous membranes
May 2025Paper1B ["HL"] · TZ13(e)[ 2 ]C3.2.2—Skin and mucous membranes
May 2024Paper2 ["HL"] · TZ28(b)[ 3 ]C3.2.2—Skin and mucous membranes
November 2020Paper3 ["HL"] · TZ021(b)[ 1 ]C3.2.2—Skin and mucous membranes
Practice this objective

Coverage 2020–2025 · Updated 16 Jul 2026

Concept essentials

  • Skin and mucous membranes has to be linked to the exact pathogen, cell, molecule or population process involved.
  • The biological effect of skin and mucous membranes depends on the sequence from trigger to protective outcome.
  • Clear distinctions within skin and mucous membranes prevent confusion with neighbouring immune responses.
  • Evidence for skin and mucous membranes is strongest when mechanism and consequence are explained together.
ConceptIB Biology HL