AQA GCSE Biology · 8461
Specification 4.5.3.3 · Paper 2
Revise: Kidney Function and Water ControlThe pituitary gland then releases more ADH into the blood.
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GCSE Biology · key term
A hormone released by the pituitary gland that increases the permeability of kidney tubules to water.
Used by AQA and OCR
Specification 4.5.3.3 · Paper 2
Revise: Kidney Function and Water ControlThe pituitary gland then releases more ADH into the blood.
Specification B3.3j · Paper 1 (Foundation), Paper 3 (Higher)
A hormone that increases the permeability of kidney tubules and collecting ducts to water, allowing more water to be reabsorbed into the blood.
In an ADH question, link each step: blood too concentrated → more ADH → tubules more permeable → more water reabsorbed → smaller volume of more concentrated urine.
Remember that ADH control is Higher Tier only for this specification.
Link every change in ADH to all three consequences: kidney-tubule permeability, water reabsorption and urine volume/concentration.
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This increased concentration stimulates thirst and greater release of ADH. ADH makes kidney tubules and collecting ducts more permeable to water, so more water is reabsorbed into the blood. Less water is then lost in urine: the urine is usually smaller in volume and more concentrated.
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Anti-diuretic hormone; a hormone released by the pituitary gland that increases the permeability of kidney tubules to water.
Revise: ADH EffectADH, or anti-diuretic hormone, is a chemical messenger released by the pituitary gland and carried in the blood to the kidneys. Its effect is to make the kidney tubules more permeable to water.
Antidiuretic hormone; a hormone released into the blood by the pituitary gland that increases the permeability of kidney tubules to water.