ConceptConceptDocsDocuments

Edexcel IAL Biology 7.20 Selective reabsorption and loop of Henle

Trace sodium or glucose transport first, then distinguish water-permeable and ion-transporting limbs and connect the medullary gradient to collecting-duct water loss.

Syllabus
First assessment 2019
Course
Biology YBI11
Level
A2

Exam points

  • Explain sodium co-transport and selective glucose reabsorption in the proximal tubule.
  • Trace ion and water movement through descending and ascending limbs of the loop.
  • Link a long loop of Henle to a steep gradient and concentrated urine in dry habitats.

7.20—Selective reabsorption and loop of Henle question 1

[Maximum number: 3]

The kidney is involved in the process of homeostasis in a mammal.

The table shows the concentration of glucose and urea in the blood plasma, glomerular filtrate and urine of an individual.

Table for Question 7.20—Selective reabsorption and loop of Henle question 1 — Edexcel A-Level Biology A2

Explain the concentration of glucose and urea in the urine.
Use the information in the table to support your answer.

All question bank results loaded