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==Key Stage 4==
===Meaning===
[[File:ExcretorySystem2.png|right|300px|thumb|A [[diagram]] of the '''excretory system'''.]]The '''excretory system''' is an [[Organ System|organ system]] in [[animal]]s that removes the waste products from [[Cell (Biology)|cells]]. ===About the Excretory System===: [[Urea]] is [[toxic]] to [[Cell (Biology)|cells]] so the [[Excretory System|excretory system]] showing the [[bladder]].]]
The '''bladder''' is an [[organ]] in the [[Excretory System|excretory system]] that stores [[urine]] before it is released.
: [[Urine]] is gradually supplied to the [[bladder]] by the [[ureter]]s.
: Once the [[bladder]] is full [[urine]] is released through the [[urethra]].
===References===
====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=27ad53b0283feeff7fc5ae04a9e205f85 ''Bladder, pages 200-201, 205, GCSE Biology; Student Book, Collins, AQA '']
====OCR====
:[https://www.amazon.co.uk/gp/product/0198359810/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359810&linkCode=as2&tag=nrjc-21&linkId=d768d99f1a06f7c12fab40e5aef85a55 ''Bladder, page 120, Gateway GCSE Biology, Oxford, OCR '']