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Health Science Medium #adh#vasopressin#osmolality

ADH and Fluid Balance

Plasma osmolality rises, posterior pituitary releases ADH, kidney conserves water.

A free, animated adh and fluid balance you can read here or embed on any website, from Scrollchart.

ADH and Fluid Balance

ADH and Fluid BalanceOsmoreceptor to pituitary to collecting duct: the body's water-conservation loopHypothalamusOsmoreceptor neuronsthreshold ~285 mOsm/kgnormal range 280 to 295Posterior Pituitaryreleases ADH (vasopressin)plasma ADH 1 to 5 pg/mL typicalADH binds V2 receptorCollecting Duct Principal Cellapical (lumen side)AQP2AQP2AQP2AQP2AQP2Aquaporin-2 channels inserted into apical membraneADH release vs plasma osmolality28029030031004812Plasma osmolality (mOsm/kg)ADH (pg/mL)threshold 285

Osmoreceptor sensing -> ADH release -> aquaporin insertion in collecting duct -> water reabsorption.

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Source & accuracy

This adh and fluid balance is an editorial illustration built to represent the concept accurately. Where it shows figures, they are typical or representative values chosen to make the relationship clear, not a single underlying dataset. The diagram and its explainer are reviewed and maintained centrally, and updated over time as understanding improves.

Sensing concentration and responding

Antidiuretic hormone (ADH, also called vasopressin) is the body's main short-term regulator of water balance. Osmoreceptors in the hypothalamus monitor the concentration of solutes in the blood. When plasma osmolality rises, signaling that the blood is too concentrated, these sensors trigger ADH release from the posterior pituitary.

ADH travels to the kidney and increases water reabsorption in the collecting ducts, so more water is returned to the blood and the urine becomes more concentrated. This dilutes the blood back toward its normal set point.

Closing the loop and what disrupts it

As osmolality falls back to normal, ADH secretion eases and the kidney lets more water leave as dilute urine, a negative feedback loop that keeps fluid balance within a narrow range. Thirst works alongside this hormonal response to restore water intake.

Imbalances in this system underlie conditions where ADH is too low, causing excessive dilute urination, or inappropriately high, causing water retention. This is general educational information about renal and endocrine physiology, not medical advice; consult a qualified professional about fluid or electrolyte concerns.

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Reference

What this is
A free, embeddable, animated adh and fluid balance for any website.
Who uses it
Medical educators, Health blogs, Patient-info sites.
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License
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URL
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Frequently asked questions

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