ADH and Osmoregulation

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Presentation transcript:

ADH and Osmoregulation

Anti-diuretic hormone Secreted by the pituitary gland in the brain

Filtrate reaching collecting duct is hypotonic (high water content) in comparison to the surrounding tissue of the medulla – water diffuses into blood

Collecting ducts permeability to water is dependent upon the presence/absence of ADH *Absent - impermeable  water stays in urine *Present - permeable  water moves into blood

Diuretics Caffeine and other drugs can inhibit Na+ reabsorption, causing less water to return to the blood by osmosis (increases urine output)

Diuretics Alcohol consumption messes with your brain – stops the production of ADH – increases urine output and causes dehydration

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