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: When the [[kidney]]s receive '''anti-diuretic hormone''' any [[water]] lost from the [[blood]] is reabsorbed into the [[blood]] causing the [[Volume (Space)|volume]] of [[urine]] to be low and its [[concentration]] to be high.
: When there is little '''anti-diuretic hormone''' the [[water]] taken out of the [[blood]] in the [[kidney]]s is passed on to the [[bladder]] via the [[ureter]]s causing the [[Volume (Space)|volume]] of [[urine]] to be high and the [[concentration]] to be low.
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0198359373/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359373&linkCode=as2&tag=nrjc-21&linkId=952a73bbb09d222ecc4b50d200679849 ''ADH, pages 160-187, GCSE Biology; Third Edition, Oxford University Press, AQA']
:[https://www.amazon.co.uk/gp/product/0008158754/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0008158754&linkCode=as2&tag=nrjc-21&linkId=27ad53b0283feeff7fc5ae04a9e205f17 ''ADH, pages 200-1, 215, GCSE Biology; Student Book, Collins, AQA']