細胞内消化

WordNet

the organic process by which food is converted into substances that can be absorbed into the body
the process of decomposing organic matter (as in sewage) by bacteria or by chemical action or heat
learning and coming to understand ideas and information; "his appetite for facts was better than his digestion"
located or occurring within a cell or cells; "intracellular fluid"

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〈C〉〈U〉『消化』[作用] / 〈U〉(知識などの)消化力,理解

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/08/10 12:38:21」(JST)

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In its broadest sense, intracellular digestion is the breakdown of substances within the cytoplasm of a cell. For example, following phagocytosis, the ingested particle (or phagosome) fuses with a lysosome containing hydrolytic enzymes to form a phagolysosome; the pathogens or food particles within the phagosome are then digested by the lysosome's enzymes.

Intracellular digestion can also refer to the process in which animals that lack a digestive tract bring food items into the cell for the purposes of digestion for nutritional needs. This kind of intracellular digestion occurs in many unicellular protozoans, in Pycnogonida, in some molluscs, Cnidaria and Porifera. There is another type of digestion, called extracellular digestion. In amphioxus, digestion is both extracellular and intracellular.^[1]

Occurrence

Most organisms that use intracellular digestion belong to Kingdom Protista, such as amoeba and paramecium.

Amoeba

Amoeba uses pseudopodia to capture food for nutrition in a process called phagocytosis.

Paramecium

Paramecium uses cilia in the oral groove to bring food into the mouth pore which goes to the gullet. At the end of the gullet, a food vacuole forms. Undigested food is carried to the anal pore.

Euglena

Euglena is photosynthetic but also engulfs and digests microorganisms.

References

^ http://www.biocyclopedia.com/index/general_zoology/subphylum_cephalochordata.php

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