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Excretion as an Example of Homeostatic Control

Osmoregulation and ADH

  • 2 things to know
  • Components 01 and 03

Overview

Osmoreceptors in the hypothalamus, where ADH is made and released, the aquaporins it places in the collecting duct, and the feedback loop that results.

What you need to know

Answer each one before you reveal it.

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Process

How does ADH regulate water balance?

Key term

Where is ADH produced and where is it stored and released from?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Where are osmoreceptors located and what do they detect?

    Model answer

    Osmoreceptors are located in the hypothalamus and detect changes in the water potential of the blood.

  2. 2

    What happens to osmoreceptors when blood water potential decreases?

    Model answer

    Osmoreceptors lose water by osmosis and shrink, stimulating the hypothalamus.

  3. 3

    Where is ADH produced and where is it stored and released from?

    Model answer

    ADH is produced by the hypothalamus and stored in and released from the posterior pituitary gland.

  4. 4

    How does ADH reach its target tissue?

    Model answer

    ADH travels in the blood to the collecting ducts of the kidneys.

  5. 5

    What happens when ADH binds to receptors on collecting duct cells?

    Model answer

    ADH binding triggers insertion of aquaporins into the cell membrane.

  6. 6

    What are aquaporins?

    Model answer

    Aquaporins are water channel proteins that increase the permeability of the collecting duct walls to water.

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