…Depending on the species, some flatworms perform only extracellular digestion, while others perform only intracellular digestion. Nemertean worms, worms, and mollusks have a well-developed digestive tract and essentially perform extracellular digestion, although in some cases this is supplemented by intracellular digestion performed by migratory amoebocytes in the wall of the digestive tract. Intracellular digestion is almost completely absent in cephalopods, crustaceans, insects, nematodes, and vertebrates. … *Some of the terminology that mentions "amoebocyte" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…扁形動物には種によって,細胞外消化のみを行うものと細胞内消化のみを行うものがある。ヒモムシ類,ゴカイ類および軟体動物は発達した消化管をもっていて,本質的には細胞外消化であるが,中には消化管壁の遊走性アメーバ細胞amoebocyteが細胞内消化をしてこれを補っている場合もある。頭足類,甲殻類,昆虫類,センチュウ類,脊椎動物では細胞内消化はほとんどみられない。… ※「amoebocyte」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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