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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.