Unlike other bilaterians, they are acoelomates having no body cavity , and have no specialized circulatory and respiratory organs , which restricts them to having flattened shapes that allow oxygen and nutrients to pass through their bodies by diffusion. The digestive cavity has only one opening for both ingestion intake of nutrients and egestion removal of undigested wastes ; as a result, the food cannot be processed continuously. In traditional medicinal texts, Platyhelminthes are divided into Turbellaria , which are mostly non- parasitic animals such as planarians , and three entirely parasitic groups: Cestoda , Trematoda and Monogenea ; however, since the turbellarians have since been proven not to be monophyletic , this classification is now deprecated. Free-living flatworms are mostly predators, and live in water or in shaded, humid terrestrial environments, such as leaf litter. Cestodes tapeworms and trematodes flukes have complex life-cycles, with mature stages that live as parasites in the digestive systems of fish or land vertebrates , and intermediate stages that infest secondary hosts.
Close up view of female crotch - stock photo
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Rectal prolapse is when the rectal walls have prolapsed to a degree where they protrude out the anus and are visible outside the body. Rectal prolapse may occur without any symptoms, but depending upon the nature of the prolapse there may be mucous discharge mucus coming from the anus , rectal bleeding , degrees of fecal incontinence and obstructed defecation symptoms. Rectal prolapse is generally more common in elderly women, although it may occur at any age and in either sex. It is very rarely life-threatening, but the symptoms can be debilitating if left untreated.
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