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Edexcel IAL Biology 7.21 ADH control of water balance

Identify the blood water-potential change, adjust pituitary ADH release, trace aquaporin insertion and state the resulting water reabsorption and urine response.

Syllabus
First assessment 2019
Course
Biology YBI11
Level
A2

Exam points

  • Trace osmoreceptors, hypothalamus and pituitary ADH release in negative feedback.
  • Explain how ADH increases aquaporins and collecting-duct water reabsorption.
  • Calculate urine output or interpret concentration changes from ADH data.

7.21—ADH and osmoregulation question 1

[Maximum number: 1]

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

Antidiuretic hormone (ADH) is required for homeostasis.

How many of these parts of the kidney respond to ADH?
- Bowman's capsule
- collecting duct
- Ioop of Henle
- proximal tubule

A 1
B 2
C 3
D 4

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