Q BankQuestion BankDocsDocuments

B2.3.7 (HL)—Adaptations to increase SA:V

Specialized absorptive cells increase effective surface area and transport capacity through microvilli, transport proteins, mitochondria, and short diffusion paths in epithelia.

Syllabus
First assessment 2025
Objective
B2.3.7
Level
HL

Exam analysis

Chance of appearing4%of analysed past papers
Latest appearanceNovember 2018
Most common paperPaper1
Typical marks1–2

Common command terms

  • Identify
  • State
  • Explain
  • Describe

Scoring notes

Common mistake
Naming microvilli without stating that they increase surface area for absorption.

Recent exam appearances

November 2018Paper3 ["HL"] · TZ018(d)[ 2 ]B2.3.7 (HL)—Adaptations to increase SA:V
May 2018Paper1 ["HL"] · TZ22[ 1 ]B2.3.7 (HL)—Adaptations to increase SA:V
May 2017Paper3 ["HL"] · TZ118(d)[ 1 ]B2.3.7 (HL)—Adaptations to increase SA:V
May 2016Paper1 ["HL"] · TZ034[ 1 ]B2.3.7 (HL)—Adaptations to increase SA:V
Practice this objective

Coverage 2016–2018 · Updated 15 Jul 2026

Concept essentials

  • Microvilli increase membrane surface area for absorption.
  • Mitochondria support ATP-dependent active transport in absorptive cells.
  • Transport proteins allow specific nutrients or ions to cross membranes.
  • Short diffusion distances improve exchange efficiency.
ConceptIB Biology HL