{"id":16593,"date":"2020-09-04T14:48:49","date_gmt":"2020-09-04T12:48:49","guid":{"rendered":"https:\/\/almanimal.com\/?p=16593"},"modified":"2020-09-04T14:48:54","modified_gmt":"2020-09-04T12:48:54","slug":"comment-une-etoile-de-mer-se-regenere","status":"publish","type":"post","link":"https:\/\/almanimal.com\/fr\/curiosites\/comment-une-etoile-de-mer-se-regenere\/","title":{"rendered":"Comment l'\u00e9toile de mer se r\u00e9g\u00e9n\u00e8re-t-elle, est-ce le secret de la vie ?"},"content":{"rendered":"

Un fait que vous ne saviez peut-\u00eatre pas L'avantage des \u00e9toiles de mer est que la plupart d'entre elles ont la capacit\u00e9 de se r\u00e9g\u00e9n\u00e9rer.<\/strong> Oui, vous avez bien lu\u00a0: ils peuvent reconstruire des bras endommag\u00e9s ou perdus, et parfois m\u00eame le corps entier\u00a0! Dans notre article d'aujourd'hui, nous vous en parlons. comment une \u00e9toile de mer se r\u00e9g\u00e9n\u00e8re<\/strong>, l'un des animaux marins <\/a>le plus \u00e9trange et le plus curieux qui vit dans les profondeurs de l'oc\u00e9an.<\/p>\n\n\n\n

D\u00e9couvrez comment une \u00e9toile de mer se r\u00e9g\u00e9n\u00e8re<\/h2>\n\n\n\n

Le ast\u00e9ro\u00efdes <\/a>ou les \u00e9toiles de mer sont une classe d'\u00e9chinodermes,<\/strong> Ainsi nomm\u00e9s parce qu'ils poss\u00e8dent un squelette interne unique compos\u00e9 d'osselets calcaires (structures durcies en carbonate de calcium). Le corps de l'\u00e9toile de mer est aplati et est form\u00e9 d'un disque pentagonal avec cinq bras ou plus.<\/strong> Les \u00e9toiles de mer se trouvent \u00e0 plus de 6\u00a0000 m\u00e8tres de profondeur, entre les zones intertidales et abyssales. Elles sont l'une des esp\u00e8ces marines<\/a> plus attrayants, principalement en raison de leurs couleurs vives dans des tons de rouge ou d'orange, bien que certains soient bleus, gris ou marron. <\/p>\n\n\n\n

\"Comment<\/figure><\/div>\n\n\n\n

Reproduction asexu\u00e9e<\/h3>\n\n\n\n

Mais saviez-vous que ces curieuses cr\u00e9atures marines sont capables de se r\u00e9g\u00e9n\u00e9rer ? La r\u00e9g\u00e9n\u00e9ration se produit principalement lors de la reproduction. <\/strong>Les ast\u00e9ro\u00efdes peuvent se reproduire dans un sexuel ou asexu\u00e9<\/strong> et certains sp\u00e9cimens sont hermaphrodites.<\/strong> Mais concentrons-nous sur la reproduction asexu\u00e9e, o\u00f9 se produit la r\u00e9g\u00e9n\u00e9ration. <\/p>\n\n\n\n

Ce type de reproduction a lieu parr fission (division d'un organisme en deux) de ses disques centraux ou par autotomie (mutilation spontan\u00e9e auto-inflig\u00e9e) des bras.<\/strong> C'est-\u00e0-dire qu'une \u00e9toile de mer est mutil\u00e9e par des situations, comme la fuite d'un pr\u00e9dateur ; et, de ce fragment, une autre \u00e9toile de mer \u00e9merge qui d\u00e9veloppe le corps complet. Certains peuvent se reproduire \u00e0 partir de fragments d\u2019\u00e0 peine 1 centim\u00e8tre de long !<\/strong><\/p>\n\n\n\n

Comment est-il possible qu\u2019un organisme se d\u00e9barrasse si facilement d\u2019une partie de son corps ?<\/strong> C'est tr\u00e8s simple : les \u00e9toiles de mer ont un type de tissu conjonctif capable de se ramollir tr\u00e8s rapidement <\/strong>En r\u00e9ponse aux signaux nerveux qui lui sont envoy\u00e9s. Comme nous l'avons mentionn\u00e9 pr\u00e9c\u00e9demment, cela peut \u00eatre d\u00fb \u00e0 la reproduction, \u00e0 un danger caus\u00e9 par un pr\u00e9dateur ou \u00e0 un accident. <\/p>\n\n\n\n

Le secret de la r\u00e9g\u00e9n\u00e9ration des \u00e9toiles de mer : les cellules souches<\/h3>\n\n\n\n

Nous avons d\u00e9j\u00e0 mentionn\u00e9 que les \u00e9toiles de mer peuvent se mutiler dans le cadre de leur processus de reproduction, mais elles sont \u00e9galement capables de couper leurs membres, ou des parties de ceux-ci, ce qui pr\u00e9senter des cellules malades.<\/strong> Mais.., Comment est-il possible qu\u2019un si petit organisme puisse se r\u00e9g\u00e9n\u00e9rer sans difficult\u00e9 apparente ?<\/strong> La r\u00e9ponse est tr\u00e8s simple et vous la connaissez peut-\u00eatre : cellules souches. <\/strong>Ces c\u00e9l\u00e8bres unit\u00e9s anatomiques dominent l'actualit\u00e9 scientifique actuelle. Une v\u00e9ritable r\u00e9volution dans le traitement de certaines maladies, la r\u00e9g\u00e9n\u00e9ration tissulaire, la r\u00e9g\u00e9n\u00e9ration cartilagineuse, etc., car les \u00e9toiles de mer en poss\u00e8dent un nombre consid\u00e9rable.<\/p>\n\n\n\n

Si une \u00e9toile de mer est capable de se r\u00e9g\u00e9n\u00e9rer par l\u2019action de cellules souches, Pourquoi les humains ne le peuvent-ils pas ? <\/strong>Pour la simple raison : Nos cellules souches ont une mission importante dans notre corps : devenir peau. <\/strong>Et, bien s\u00fbr, nous sommes des organismes beaucoup plus complexes que les \u00e9toiles de mer. Comment une \u00e9toile de mer se r\u00e9g\u00e9n\u00e8re-t-elle\u00a0? Comment fonctionnent les cellules souches\u00a0?<\/strong><\/p>\n\n\n\n

\"Les<\/figure><\/div>\n\n\n\n

Les \u00e9toiles de mer ont une sym\u00e9trie radiale, donc si vous coupez une extr\u00e9mit\u00e9, une autre petite appara\u00eet dans la r\u00e9gion centrale. C'est \u00e0 ce moment-l\u00e0 que les cellules souches entrent en action et font lentement pousser le nouveau membre vers l'ext\u00e9rieur, vers l'arri\u00e8re. <\/strong>La croissance est ind\u00e9termin\u00e9e et le nouveau membre grandit et grandit, jusqu\u2019\u00e0 ce que, une fois de plus, les cellules souches interviennent pour assurer un d\u00e9veloppement proportionnel. <\/p>\n\n\n\n

Les cellules souches st\u00e9ro\u00efdes sont capables de devenir \u00e0 la fois des organes et des tissus, Et comment savent-ils en quoi ils doivent se transformer ?<\/strong> Cela reste un myst\u00e8re pour la science. <\/p>\n\n\n\n

Tous ne se r\u00e9g\u00e9n\u00e8rent pas de la m\u00eame mani\u00e8re<\/h3>\n\n\n\n

Tous les ast\u00e9ro\u00efdes ne poss\u00e8dent pas la capacit\u00e9 de se r\u00e9g\u00e9n\u00e9rer, et il existe des diff\u00e9rences entre ceux qui en sont dot\u00e9s. Par exemple, Certains peuvent d\u00e9velopper de nouveaux bras, ou des portions de bras. D'autres, par exemple, peuvent d\u00e9velopper un nouveau disque central. <\/strong>\u00e0 partir d'un seul bras, et d'autres n\u00e9cessitent qu'une partie du disque central soit connect\u00e9e \u00e0 la partie s\u00e9par\u00e9e. <\/p>\n\n\n\n

Mais ne pensez pas que le processus de r\u00e9g\u00e9n\u00e9ration se produit comme par magie et que, dans quelques minutes ou quelques jours, l\u2019\u00e9toile de mer sera \u00ab comme neuve \u00bb. La r\u00e9g\u00e9n\u00e9ration peut prendre plusieurs mois, voire plusieurs ann\u00e9es.<\/strong>, et tous les processus de r\u00e9g\u00e9n\u00e9ration ne r\u00e9ussissent pas, car \u00e0 cette p\u00e9riode et dans les premiers stades, comme tout \u00eatre vivant qui subit une blessure, les ast\u00e9ro\u00efdes sont sujets \u00e0 contracter des infections, ce qui rend le processus quelque peu difficile. <\/p>\n\n\n\n

Le membre qui a \u00e9t\u00e9 s\u00e9par\u00e9 du disque central survit gr\u00e2ce aux nutriments stock\u00e9s \u00e0 l\u2019int\u00e9rieur. jusqu'\u00e0 ce qu'un nouveau disque central et - une bouche ! - repoussent, afin que la nouvelle \u00e9toile de mer, ou ce minuscule organisme en passe de le devenir, puisse se nourrir. <\/strong><\/p>","protected":false},"excerpt":{"rendered":"

Un dato que quiz\u00e1 no conoc\u00edas de las estrellas de mar es que la mayor\u00eda de ellas tienen capacidad de regeneraci\u00f3n. S\u00ed, has le\u00eddo bien: pueden reconstruir los brazos da\u00f1ados o perdidos y, en ocasiones \u00a1el cuerpo entero! En nuestro art\u00edculo de hoy te contaremos c\u00f3mo se regenera una estrella de mar, uno de los … Lire la suite<\/a><\/p>","protected":false},"author":20,"featured_media":16600,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1430],"tags":[1905,1894,1595,1737,2190,1468,1819,2189],"class_list":["post-16593","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-curiosidades","tag-animales-acuaticos","tag-animales-curiosos","tag-animales-de-acuario","tag-animales-exoticos","tag-animales-marinos","tag-curiosidades","tag-curiosidades-sobre-los-peces","tag-estrellas-de-mar"],"yoast_head":"\n\u00bfC\u00f3mo se regenera una estrella de mar? \u00bfEs el secreto de la vida?<\/title>\n<meta name=\"description\" content=\"En nuestro art\u00edculo de hoy te contamos c\u00f3mo se regenera una estrella de mar: por reproducci\u00f3n asexual o por mutilaci\u00f3n \u00a1Es sorprendente!\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/almanimal.com\/fr\/curiosites\/comment-une-etoile-de-mer-se-regenere\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u00bfC\u00f3mo se regenera una estrella de mar? 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