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D3.3.10 (HL)—Osmoregulation by collecting ducts

ADH increases collecting duct water permeability through aquaporins, restoring water balance when blood is too concentrated in human physiology in human physiology.

Syllabus
First assessment 2025
Objective
D3.3.10
Level
HL

Exam analysis

Chance of appearing16%of analysed past papers
Latest appearanceMay 2025
Most common paperPaper2
Typical marks1–5

Common command terms

  • Describe
  • Explain
  • Identify
  • State
  • Outline

Recent exam appearances

May 2025Paper2 ["HL"] · TZ18(c)[ 7 ]D3.3.10 (HL)—Osmoregulation by collecting ducts
May 2024Paper2 ["HL"] · TZ16(b)[ 5 ]D3.3.10 (HL)—Osmoregulation by collecting ducts
November 2023Paper3 ["HL"] · TZ223(a)[ 1 ]D3.3.10 (HL)—Osmoregulation by collecting ducts
November 2023Paper3 ["HL"] · TZ123(a)[ 1 ]D3.3.10 (HL)—Osmoregulation by collecting ducts
May 2023Paper2 ["HL"] · TZ16(a)[ 4 ]D3.3.10 (HL)—Osmoregulation by collecting ducts
Practice this objective

Coverage 2012–2025 · Updated 16 Jul 2026

Concept essentials

  • High blood solute concentration stimulates ADH release.
  • ADH increases aquaporins and water permeability in collecting ducts.
  • More ADH produces smaller volumes of more concentrated urine.
ConceptIB Biology HL