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GCSE Biology · key term
A hormone that controls how much water is reabsorbed from the kidney tubules into the blood.
Used by OCR
Specification B3.3i · Paper 1 (Foundation), Paper 3 (Higher)
Revise: Effect of ADHAntidiuretic hormone, usually shortened to ADH, is carried in the bloodstream from the pituitary gland to the kidneys. It changes the permeability of the kidney tubules to water.
Do not say that ADH makes the kidney tubules less permeable when the blood lacks water. Low blood water content causes more ADH, greater permeability and more water reabsorption.
Link ADH concentration to both urine volume and urine concentration: more ADH produces a smaller volume of more concentrated urine; less ADH produces a larger volume of more dilute urine.
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