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[[File:ExcretorySystem.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 [[urea]] from the [[blood]]. ===About the Excretory System===: [[Urea]] is [[toxic]] to [[Cell (Biology)|cells]] so the '''excretory system''' is essential to remove it from the [[blood]].: The '''excretory system''' is made of the following parts::*The [[Kidney]]s - Which filter the [[blood]] to remove [[urea]].:*The [[Ureter]]s - Tubes which transport [[urine]] from the [[kidney]]s to the [[bladder]].:*The [[Bladder]] - Where [[urine]] is stored before being released.:*The [[Urethra]] - A tube to allow [[urine]] to be released from the [[bladder]]. ==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===: [[ToxicUrea]] is [[toxic]] to [[Cell (Biology)|toxinscells]] so the '''excretory system''' is essential to remove it from the [[blood]].: The '''excretory system''' is made of the following parts::*The [[Kidney]]s - Which filter the [[blood]] to remove [[urea]], excess [[water]] (for [[Osmoregulation]]) and [[salt]].:*The [[Ureter]]s - Tubes which transport [[urine]] from the [[kidney]]s to the [[bladder]].:*The [[Bladder]] - Where [[urine]] is stored before being released.:*The [[Urethra]] - A tube to allow [[urine]] to be released from the body[[bladder]].