D3.3.9 (HL)—Loop of Henle
The loop of Henle creates a medullary concentration gradient that allows water reabsorption and concentrated urine production in human physiology.
- Syllabus
- First assessment 2025
- Objective
- D3.3.9
- Level
- HL
Exam analysis
Chance of appearing5%of analysed past papers
Latest appearanceNovember 2022
Most common paperPaper1
Typical marks1
Common command terms
- Identify
- State
Recent exam appearances
November 2022Paper2 ["HL"] · TZ05(b)[ 1 ]D3.3.9 (HL)—Loop of Henle
May 2019Paper1 ["HL"] · TZ233[ 1 ]D3.3.9 (HL)—Loop of Henle
November 2016Paper1 ["HL"] · TZ039[ 1 ]D3.3.9 (HL)—Loop of Henle
May 2014Paper1 ["HL"] · TZ140[ 1 ]D3.3.9 (HL)—Loop of Henle
May 2013Paper1 ["HL"] · TZ239[ 1 ]D3.3.9 (HL)—Loop of Henle
Practice this objective
Coverage 2012–2022 · Updated 16 Jul 2026
Concept essentials
- The descending limb allows water to leave the filtrate.
- The ascending limb removes salts and helps make the medulla hypertonic.
- The medullary gradient supports water reabsorption from collecting ducts.