Edexcel GCSE Biology · 1BI0
Specification 7.20B · Paper 2
- Revise: Effect of ADH
The ease with which a substance can pass through a surface.
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GCSE Biology · key term
The ability of a surface or membrane to allow a substance to pass through it.
Used by Edexcel and OCR
Specification 7.20B · Paper 2
The ease with which a substance can pass through a surface.
Specification B3.3i · Paper 1 (Foundation), Paper 3 (Higher)
The ability of a surface or membrane to allow a substance, such as water, to pass through it.
Antidiuretic 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.
Link each change in ADH to collecting-duct permeability, water reabsorption and the volume and concentration of urine.
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 every change in ADH to all three consequences: kidney-tubule permeability, water reabsorption and urine volume/concentration.
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Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: ADH EffectFor OCR Biology B, the effect of ADH on kidney-tubule permeability is separate-science content.