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==Key Stage 2=====Meaning===The [[anus]] is part of the [[Digestive System|digestive system]] that [[Faeces|poo]] comes out of. ===About the Anus===: The muscles in the anus need to relax to let out the poo. You should not try to 'push' the poo out or it can cause [[piles]]. ==Key Stage 3==[[File:Anus.png|right|300px|thumb|A computer generated image showing the small intestine, large intestine, rectum and anus.]]The [[anus]] is a ring of [[muscle]] at the end of the [[Digestive System|digestive system]] thatholds tight until [[faeces]] is ready to be released. ===About The Anus===: The [[anus]] is found at the end of the [[rectum]].: When the [[muscle]] s of the [[anus]] relax then [[faeces]] can be released.: When the [[muscle]]s of the [[anus]] [[contract]] it holds tight until the [[faeces]] in.: If the [[faeces]] (poo) needs does not come out when you relax then you have [[constipation]] and need to be releasedeat more [[fibre]].