The digestive system of every living being has the task of introducing, digesting and absorbing the nutritional principles contained in food, eliminating residues that cannot be used for metabolism, in the form of faeces. It is called apparatus as it is a grouping of organs that collaborate for a common purpose, but different both in function and in structure and in embryological origin. The expression refers to multicellular organisms, and as it is able to assimilate it refers to heterotrophs, while using the concept of digestion for autotrophic organisms, such as carnivorous plants, and their corresponding digestive organs. It is generally primarily an animal organ. Proctodeates are animals with a complete alimentary canal, that is, equipped with a mouth for the introduction of food and an anus for the expulsion of feces, while the aprocti organisms (cnidarians, flatworms, gnathostomulids) show an incomplete canal, with an single opening that acts as both mouth and anus. Coelomate metazoans that have a differentiated digestive system are classified as protostomes and deuterostomes, where the gut has evolved twice, for an example of convergent evolution. They are distinguished on the basis of their embryonic development. Deuterostomes develop the anus from the blastopore and the mouth forms at the opposite end, vice versa for the protostomes. Protostomes are, as main groups, arthropods, mollusks, and annelids, while deuterostomes include echino
The digestive system of every living being has the task of introducing, digesting and absorbing the nutritional principles contained in food, eliminating residues that cannot be used for metabolism, in the form of faeces. It is called apparatus as it is a grouping of organs that collaborate for a common purpose, but different both in function and in structure and in embryological origin. The expression refers to multicellular organisms, and as it is able to assimilate it refers to heterotrophs, while using the concept of digestion for autotrophic organisms, such as carnivorous plants, and their corresponding digestive organs. It is generally primarily an animal organ. Proctodeates are animals with a complete alimentary canal, that is, equipped with a mouth for the introduction of food and an anus for the expulsion of feces, while the aprocti organisms (cnidarians, flatworms, gnathostomulids) show an incomplete canal, with an single opening that acts as both mouth and anus. Coelomate metazoans that have a differentiated digestive system are classified as protostomes and deuterostomes, where the gut has evolved twice, for an example of convergent evolution. They are distinguished on the basis of their embryonic development. Deuterostomes develop the anus from the blastopore and the mouth forms at the opposite end, vice versa for the protostomes. Protostomes are, as main groups, arthropods, mollusks, and annelids, while deuterostomes include echino
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