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Anus
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==Key Stage 3==
===Meaning===
[[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]] that holds tight until [[faeces]] is ready to be released.
: When the [[muscle]]s of the [[anus]] [[contract]] it holds the [[faeces]] in.
: If the [[faeces]] does not come out when you relax then you have [[constipation]] and need to eat more [[fibre]].
==Key Stage 4==
===Meaning===
The [[anus]] is a [[sphincter]] at the end of the [[Digestive System|digestive system]] that holds tight until [[faeces]] is ready to be [[Egestion|egested]].
===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 [[Egestion|egested]].
: When the [[muscle]]s of the [[anus]] [[contract]] it holds the [[faeces]] in.