{"id":16788,"date":"2020-09-25T08:00:00","date_gmt":"2020-09-25T06:00:00","guid":{"rendered":"https:\/\/almanimal.com\/?p=16788"},"modified":"2020-09-25T10:12:52","modified_gmt":"2020-09-25T08:12:52","slug":"systeme-respiratoire-des-poissons","status":"publish","type":"post","link":"https:\/\/almanimal.com\/fr\/curiosites\/systeme-respiratoire-des-poissons\/","title":{"rendered":"Le syst\u00e8me respiratoire des poissons expliqu\u00e9 pas \u00e0 pas"},"content":{"rendered":"<p>Vous savez probablement que <strong>La plupart des poissons qui vivent sur Terre respirent gr\u00e2ce \u00e0 leurs branchies.<\/strong>, mais vous ignoriez probablement qu&#039;ils peuvent respirer de plusieurs autres mani\u00e8res. Vous n&#039;y aviez jamais pens\u00e9\u00a0? Dans cet article, nous allons vous expliquer le syst\u00e8me respiratoire des poissons, \u00e9tape par \u00e9tape.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Les diff\u00e9rents modes de fonctionnement du syst\u00e8me respiratoire des poissons<\/h2>\n\n\n\n<p>Le syst\u00e8me respiratoire des poissons doit s&#039;adapter \u00e0 deux limitations importantes de la vie sous-marine. D&#039;une part, <strong>La quantit\u00e9 d&#039;oxyg\u00e8ne dissous est plus faible dans l&#039;eau que dans l&#039;air<\/strong>\u00c0 23 \u00b0C, l&#039;air contient 210 ml d&#039;oxyg\u00e8ne par litre d&#039;air, tandis que dans l&#039;eau douce, ce taux est d&#039;environ 6,6 ml\/l et dans l&#039;eau sal\u00e9e, de 5,3 ml\/l. En revanche, <strong>L&#039;eau est beaucoup plus dense et plus visqueuse que l&#039;air<\/strong>. <\/p>\n\n\n\n<p>Ces limitations expliquent les adaptations respiratoires de ce groupe d&#039;animaux et distinguent le syst\u00e8me respiratoire des poissons de celui de nombreux autres animaux. Cela dit, on peut constater que les poissons<strong> Ils peuvent respirer de trois mani\u00e8res diff\u00e9rentes<\/strong>:<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1000\" height=\"750\" src=\"https:\/\/almanimal.com\/wp-content\/uploads\/2020\/09\/pez-respirar-1000x750.jpg\" alt=\"respiration du poisson\" class=\"wp-image-16848\" srcset=\"https:\/\/almanimal.com\/wp-content\/uploads\/2020\/09\/pez-respirar-1000x750.jpg 1000w, https:\/\/almanimal.com\/wp-content\/uploads\/2020\/09\/pez-respirar-300x225.jpg 300w, https:\/\/almanimal.com\/wp-content\/uploads\/2020\/09\/pez-respirar-768x576.jpg 768w, https:\/\/almanimal.com\/wp-content\/uploads\/2020\/09\/pez-respirar.jpg 1024w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">La respiration branchiale, le syst\u00e8me respiratoire le plus connu des poissons.<\/h3>\n\n\n\n<p>Contrairement aux animaux qui vivent sur terre, qui ont des poumons pour extraire de l\u2019air l\u2019oxyg\u00e8ne dont ils ont besoin pour vivre, <strong>Les poissons ont des branchies \u00e0 travers lesquelles ils peuvent respirer l\u2019oxyg\u00e8ne pr\u00e9sent dans l\u2019eau.<\/strong>. <\/p>\n\n\n\n<p>La cavit\u00e9 buccale des poissons communique avec l&#039;ext\u00e9rieur par la bouche et les poches pharyng\u00e9es, <strong>ouvertures lat\u00e9rales pr\u00e9sentes dans le pharynx dans lesquelles se d\u00e9veloppent les branchies<\/strong>Gr\u00e2ce \u00e0 l&#039;opercule (ou opercule), structure dure situ\u00e9e de chaque c\u00f4t\u00e9 de la t\u00eate, les branchies sont prot\u00e9g\u00e9es.<\/p>\n\n\n\n<p>La structure des branchies est complexe. \u00c0 partir des arcs branchiaux, des structures courbes traversent les poches pharyngiennes de chaque c\u00f4t\u00e9 de la t\u00eate.<strong> deux filaments branchiaux formant un V<\/strong>Ces filaments forment les plaques branchiales, replis des filaments pari\u00e9taux dispos\u00e9s perpendiculairement. De chaque c\u00f4t\u00e9 du filament, on trouve entre 10 et 40 plaques par mm. Par cons\u00e9quent, <strong>C&#039;est dans ces feuillets que se produisent les \u00e9changes gazeux car ils constituent une paroi tissulaire tr\u00e8s fine.<\/strong> et sont bien irrigu\u00e9s en sang.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Comment se d\u00e9roule la respiration par les branchies ?<\/h4>\n\n\n\n<p>Le processus commence lorsque le poisson avale de l&#039;eau par la bouche. L&#039;eau p\u00e9n\u00e8tre par cette ouverture et traverse les filaments branchiaux (aussi appel\u00e9s branchies), qui contiennent de nombreuses veines et nerfs. <strong>Les filaments branchiaux absorbent l&#039;oxyg\u00e8ne de l&#039;eau et le transf\u00e8rent \u00e0 la circulation sanguine. Le c\u0153ur du poisson pompe le sang pour distribuer l&#039;oxyg\u00e8ne dans tout le corps.<\/strong> et en m\u00eame temps, le dioxyde de carbone du sang est expuls\u00e9 par les branchies et renvoy\u00e9 dans l&#039;eau.<\/p>\n\n\n\n<p>Ainsi, l&#039;eau <em>oxyg\u00e9n\u00e9<\/em> en passant par la bouche, il traverse les branchies et quitte finalement la cavit\u00e9 buccale par l&#039;opercule, tandis que le sang circule dans la direction oppos\u00e9e \u00e0 travers les lamelles pour pi\u00e9ger l&#039;oxyg\u00e8ne.<\/p>\n\n\n\n<p>Les larves de nombreux poissons poss\u00e8dent des branchies externes de chaque c\u00f4t\u00e9 de la t\u00eate. Aux stades suivants, les branchies deviennent internes.<strong> Les poissons dot\u00e9s d&#039;un syst\u00e8me respiratoire branchial sont les myxines, les lamproies, les \u00e9lasmobranches et les poissons osseux.<\/strong>.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-large\"><img decoding=\"async\" width=\"1000\" height=\"666\" src=\"https:\/\/almanimal.com\/wp-content\/uploads\/2020\/09\/branquias-tiburon-1000x666.jpg\" alt=\"branchies de requin syst\u00e8me respiratoire des poissons\" class=\"wp-image-16850\" srcset=\"https:\/\/almanimal.com\/wp-content\/uploads\/2020\/09\/branquias-tiburon-1000x666.jpg 1000w, https:\/\/almanimal.com\/wp-content\/uploads\/2020\/09\/branquias-tiburon-300x200.jpg 300w, https:\/\/almanimal.com\/wp-content\/uploads\/2020\/09\/branquias-tiburon-768x512.jpg 768w, https:\/\/almanimal.com\/wp-content\/uploads\/2020\/09\/branquias-tiburon.jpg 1280w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><\/figure><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Respirer avec les poumons : rare, mais pas impossible<\/h3>\n\n\n\n<p>On sait qu\u2019environ 400 esp\u00e8ces de poissons (principalement osseux) poss\u00e8dent un syst\u00e8me respiratoire qui leur permet de respirer de l\u2019air. <strong>La plupart d&#039;entre eux vivent dans les eaux douces <\/strong>Quoi qu&#039;il en soit, ils partagent les deux m\u00e9canismes\u00a0: ils poss\u00e8dent \u00e0 la fois des branchies et des poumons. Ces esp\u00e8ces, dot\u00e9es de ces deux m\u00e9canismes, utilisent souvent leurs poumons \u00e0 certaines occasions\u00a0:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Lorsque le niveau d\u2019oxyg\u00e8ne dans l\u2019eau baisse.<\/li><li>Lorsque la temp\u00e9rature augmente (car plus la temp\u00e9rature est \u00e9lev\u00e9e, plus les besoins en oxyg\u00e8ne sont \u00e9lev\u00e9s).<\/li><\/ul>\n\n\n\n<p>Poisson-poumon (<em>Dipnoi<\/em>) font partie des esp\u00e8ces de poissons dot\u00e9es du syst\u00e8me respiratoire le plus avanc\u00e9. Leur <strong>les poumons ont des cr\u00eates et des cloisons semblables \u00e0 celles des <a href=\"https:\/\/almanimal.com\/fr\/terrariums\/amphibiens\/axolotl-quest-ce-que-les-curiosites\/\">amphibiens<\/a><\/strong>. Les <strong>dipneuste australien<\/strong> (<em>N\u00e9oc\u00e9ratodus<\/em>) peut respirer avec ses deux branchies et un seul poumon.<strong> dipneuste africain<\/strong> (<em>Protopt\u00e8re<\/em>) et le <strong>Poisson-poumon d&#039;Am\u00e9rique du Sud<\/strong> (<em>l\u00e9pidosir\u00e8ne<\/em>) respirent gr\u00e2ce \u00e0 des poumons complexes et des branchies simples. Ces poissons ont besoin de respirer de l&#039;air de temps en temps, sinon ils meurent.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Autres syst\u00e8mes respiratoires que les poissons peuvent utiliser<\/h2>\n\n\n\n<p>De nombreux poissons ont la capacit\u00e9 de <strong>respirer \u00e0 travers la peau<\/strong>, surtout \u00e0 la naissance, car ils sont si petits qu&#039;ils ne disposent pas d&#039;organes sp\u00e9cialis\u00e9s pour cela.<strong> Au fur et \u00e0 mesure que l&#039;animal grandit, les branchies et\/ou les poumons se d\u00e9veloppent<\/strong> La diffusion cutan\u00e9e n&#039;\u00e9tant pas suffisante, la peau peut \u00eatre responsable d&#039;\u00e9changes gazeux de 20% ou plus chez certains adultes. D&#039;autres peuvent le faire par la bouche, le pharynx, l&#039;\u0153sophage, l&#039;intestin ou le rectum, comme c&#039;est le cas pour Hoplosternum.<\/p>\n\n\n\n<p>Certaines esp\u00e8ces ont d\u00e9velopp\u00e9 des cavit\u00e9s au-del\u00e0 des branchies, <strong>chambres suprabranchiales, qui peuvent \u00eatre remplies d&#039;air<\/strong>Chez d&#039;autres, des organes complexes peuvent se d\u00e9velopper \u00e0 partir d&#039;un arc branchial riche en sang, agissant comme un poumon. C&#039;est le cas du poisson-chat et d&#039;Electrophorus.<\/p>\n\n\n\n<p>Certains poissons ont la capacit\u00e9 de <strong>respirer de l&#039;air sans adaptation sp\u00e9cifique<\/strong>C&#039;est le cas de l&#039;anguille d&#039;Am\u00e9rique (Anguilla rostrata), qui couvre 60 % de ses besoins en oxyg\u00e8ne par sa peau et 40 % de ses besoins en oxyg\u00e8ne en ing\u00e9rant l&#039;air de l&#039;atmosph\u00e8re.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">R\u00e9f\u00e9rences<\/h2>\n\n\n\n<p>Camps, M.A. (9 septembre 2015). Comment les poissons respirent-ils\u00a0? (Consult\u00e9 le 24 septembre 2020) <a href=\"https:\/\/allyouneedisbiology.wordpress.com\/2015\/09\/09\/fish-breathing\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/allyouneedisbiology.wordpress.com\/2015\/09\/09\/fish-breathing\/<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>Es probable que sepas que la mayor\u00eda de los peces que habitan en la Tierra respiran gracias a que tienen branquias, pero seguro que no ten\u00edas ni idea de que pueden respirar de varias formas m\u00e1s. \u00bfNunca lo hab\u00edas pensado? En este post, te traemos el sistema respiratorio de los peces explicado paso a paso. &#8230; <a title=\"Le syst\u00e8me respiratoire des poissons expliqu\u00e9 pas \u00e0 pas\" class=\"read-more\" href=\"https:\/\/almanimal.com\/fr\/curiosites\/systeme-respiratoire-des-poissons\/\" aria-label=\"En savoir plus sur El sistema respiratorio de los peces explicado paso a paso\">Lire la suite<\/a><\/p>","protected":false},"author":20,"featured_media":16849,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1430],"tags":[1468,1819,1820,1903,1902],"class_list":["post-16788","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-curiosidades","tag-curiosidades","tag-curiosidades-sobre-los-peces","tag-peces","tag-respiracion-animales-acuaticos","tag-respiracion-peces"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>El sistema respiratorio de los peces explicado paso a paso<\/title>\n<meta name=\"description\" content=\"\u00bfSab\u00edas que no todos los peces respiran con branquias? 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