OCR GCSE Biology B · J257
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: Osmotic Challenge ResponseReceptors: osmoreceptors in the hypothalamus detect a change in the concentration of the blood.
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GCSE Biology · key term
A cell that detects changes in the concentration of body fluids.
Used by OCR
Paper 1 (Foundation), Paper 2 (Foundation), Paper 3 (Higher), Paper 4 (Higher)
Revise: Osmotic Challenge ResponseReceptors: osmoreceptors in the hypothalamus detect a change in the concentration of the blood.
For an explanation question, write the whole causal chain: osmotic challenge → change in blood concentration → osmoreceptors in the hypothalamus → altered ADH release by the pituitary gland → altered collecting-duct permeability → altered water reabsorption and urine.
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