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anus

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anus

Opening at the end of the alimentary canal which allows undigested foods and other waste materials to pass out of the body in the form of faeces. In humans the term is also used to describe the last 4 cm/1.5 in of the alimentary canal. It is normally kept closed by a ring of muscle called a sphincter. A common medical condition in humans associated with the anus is haemorrhoids (piles).

The anus is found in all types of multicellular animal except the coelenterates (sponges) and the platyhelminths (flatworms), which have a mouth only.
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He had a large pair of bellows, with a long slender muzzle of ivory: this he conveyed eight inches up the anus, and drawing in the wind, he affirmed he could make the guts as lank as a dried bladder.
Gulliver's Travels by Swift, Jonathan View in context
 
 
 
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