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The origin of the anus
Discovering the origin of the mouth and anus | News | UiB
Animals have evolved different types of digestive systems to aid in the digestion of the different foods they consume. The simplest example is that of a gastrovascular cavity and is found in organisms with only one opening for digestion. Platyhelminthes flatworms , Ctenophora comb jellies , and Cnidaria coral, jelly fish, and sea anemones use this type of digestion. Ingested material enters the mouth and passes through a hollow, tubular cavity.
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The Body’s Most Embarrassing Organ Is an Evolutionary Marvel
The anus from Latin anus meaning "ring", "circle" is an opening at the opposite end of an animal's digestive tract from the mouth. Its function is to control the expulsion of feces , the residual semi-solid waste that remains after food digestion, which, depending on the type of animal, includes: matter which the animal cannot digest, such as bones ;  food material after the nutrients have been extracted, for example cellulose or lignin ; ingested matter which would be toxic if it remained in the digestive tract; and dead or excess gut bacteria and other endosymbionts. Amphibians, reptiles, and birds use the same orifice known as the cloaca for excreting liquid and solid wastes, for copulation and egg -laying. Monotreme mammals also have a cloaca, which is thought to be a feature inherited from the earliest amniotes via the therapsids.
The mouth and anus are not connected in the development of the embryo as earlier thought, shows a ground-breaking study from the Sars Centre, published in Nature Ecology and Evolution. Animals often form either the mouth or the anus from an opening that appears in the early embryo, which is called the blastopore. For instance, starfish develop the anus from the blastopore, but earthworms form the mouth out of it.