Question
A student drinks 1 litre of water quickly. Explain how the body returns blood water concentration to normal. (6 marks)
Mark scheme (any 6):
- Blood becomes more dilute / water potential rises (1)
- Osmoreceptors in hypothalamus detect change (1)
- Pituitary gland releases less ADH (1)
- Kidney collecting duct / tubules become less permeable to water (1)
- Less water reabsorbed into blood (1)
- Large volume of dilute urine produced (1)
- Negative feedback returns blood concentration to set point (1)
6 marks · take your time before peeking.
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Generated by TopMyGrade AI · cross-check official sources before relying on the mark-scheme phrasing.