Uploaded September 2024 | Updated September 2026, 23 hours ago

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In this video we look at osmoregulation and antidiuretic hormone (ADH). First we explore how the secretion of antidiuretic hormone by the pituitary gland is controlled by osmoreceptor cells in the hypothalamus. We then look at how antidiuretic hormone triggers cells in the collecting ducts of the kidneys to reabsorb more water back into the blood. This includes the roles of the second messenger cyclic AMP and aquaporin proteins. Finally, we look at how osmoregulation is an example of negative feedback.

Image credits:

Hypothalamus
commons.wikimedia.org/wiki/File:Hypothalamus.png
No machine-readable author provided. Jomegat assumed (based on copyright claims)., CC BY-SA 3.0 creativecommons.org/licenses/by-sa/3.0/, via Wikimedia Commons

Pasta
commons.wikimedia.org/wiki/File:Maccaronara_01.jpg
VinRock80, CC BY-SA 4.0 creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

Cola with ice
commons.wikimedia.org/wiki/File:Tumbler_of_cola_with_ice.jpg
Simon Cousins from High Wycombe, England, CC BY 2.0 creativecommons.org/licenses/by/2.0, via Wikimedia Commons

Toilet
commons.wikimedia.org/wiki/File:Clean_Toilet_Bowl.jpg
Bodhi Peace, CC BY-SA 4.0 creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons

Sweat
commons.wikimedia.org/wiki/File:JP%27s_all_sweaty_--_he_was_carrying_Oscar._He%27s_the_man_(69487890).jpg
Phil Scoville from Orem, UT, USA, CC BY 2.0 creativecommons.org/licenses/by/2.0, via Wikimedia Commons