Gastrointestinal tract

Continuo a scrivere alcuni post (con materiale preso dal web) dedicati ad argomenti di medicina che mi coinvolgono personalmente in seguito all’interesse che suscitano in me.
In particolare quest’argomento mi attrae poiché sto soffrendo di tenesmo con sanguinamento a partire dall’anno 2009, con qualche periodo di tregua.

The gastrointestinal tract, also known as the gut or alimentary canal, is a tube by which bilaterian animals (including humans) transfer food to the digestion organs.[1] In large bilaterians, the gastrointestinal tract generally also has an exit, the anus, by which the animal disposes of solid wastes. Some small bilaterians have no anus and dispose of solid wastes by other means (for example, through the mouth).[2]

Animals that have gastrointestinal tracts are classified as either protostomes or deuterostomes. The digestive tract evolved separately in these two clades, an example of convergent evolution. The clades are distinguished based on their embryonic development: protostomes develop their mouths first, while deuterostomes develop their mouths second. Protostomes include arthropods, molluscs, and annelids, while deuterostomes include echinoderms and chordates.

The gastrointestinal tract contains thousands of different bacteria, but humans can be divided into three main groups based on those most prominent in the human gastrointestinal tract.[3]

For more specific information on digestive organs, see specialized organs and behaviours.

(Source: Wikipedia)



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