翻訳と辞書 Words near each other ・ Cuvier Grover ・ Cuvier Island ・ Cuvier Island Lighthouse ・ Cuvier Press Club ・ Cuvier Press Club Building ・ Cuvier Rempart ・ Cuvier's beaked whale ・ Cuvier's dwarf caiman ・ Cuvier's gazelle ・ Cuvier's spiny rat ・ Cuvier, Jura ・ Cuviera ・ Cuvieri-Pläner Formation ・ Cuvierian organ ・ Cuvierian Society of Cork ・ Cuvierian tubules ・ Cuvieronius ・ Cuvier–Geoffrey debate ・ Cuvillers ・ Cuvillier ・ Cuvilliés Theatre ・ Cuvilly ・ Cuvio ・ Cuvo River ・ Cuvok language ・ Cuvry ・ Cuvânt Moldovenesc ・ Cuvânt moldovenesc (disambiguation) ・ Cuvânt Moldovenesc (magazine) ・ Cuvântul Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Cuvierian tubules ： ウィキペディア英語版 Cuvierian tubules Cuvierian tubules are clusters of fine tubes located at the base of the respiratory tree in some sea cucumbers in the genera ''Bohadschia'', ''Holothuria'' and ''Pearsonothuria'', all of which are included in the family Holothuriidae. The tubules can be discharged through the anus when the sea cucumber is stressed. They lengthen when they come into contact with seawater and become adhesive when they encounter objects so that they function as a defence against potential predators. They are named after the French zoologist Georges Cuvier, who first described them. ==Mode of action== There may be several hundred Cuvierian tubules which are attached to the left respiratory tree and lie freely in the coelomic fluid in the body cavity. When stressed, the sea cucumber faces away from the attacker and contracts its body wall muscles sharply. This causes the wall of the cloaca to tear and the anus to gape and the free ends of some of the tubes to be ejected. Water from the respiratory tree is forced into these tubules causing a rapid expansion and they elongate by up to twenty times their original length. They have great tensile strength and become sticky when they encounter any object. The adhesive is unique among marine invertebrates and a firm grip is obtained in under ten seconds.〔 The mass of threads can entangle and immobilize potential predators such as small fish or crabs. The threads become detached from the sea cucumber which crawls away.〔 The tubules are readily regenerated, a process that takes about seventeen days in ''Holothuria leucospilota'' and five weeks in ''Holothuria forskali''. The tubules contain a toxic saponin called holothurin, which is also present in the body wall in some sea cucumber species. Image:Holothuria forskali Rab2011 h 3798.JPG|''Holothuria forskali'' Image:Tubes de Cuvier émis par Holothuria pervicax.jpg|''Holothuria pervicax'' 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Cuvierian tubules」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.