{"id":16506,"date":"2021-01-28T00:00:00","date_gmt":"2021-01-27T23:00:00","guid":{"rendered":"https:\/\/www.ecoceutics.com\/com-funciona-sistema-immunitari\/"},"modified":"2023-03-22T17:10:27","modified_gmt":"2023-03-22T16:10:27","slug":"com-funciona-sistema-immunitari","status":"publish","type":"post","link":"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/salut\/com-funciona-sistema-immunitari\/","title":{"rendered":"Com funciona el sistema immunitari?"},"content":{"rendered":"<p>El sistema immunitari, immunol\u00f2gic o immune \u00e9s el conjunt d\u2019\u00f2rgans, c\u00e8l\u00b7lules i processos que s\u2019encarreguen de protegir al nostre organisme d\u2019atacs exteriors, mantenint un equilibri que ens permet continuar funcionant correctament. \u00c9s capa\u00e7 de defensar-nos d\u2019atacs externs de naturalesa biol\u00f2gica (virus, bacteris, par\u00e0sits), f\u00edsica (radiacions) o qu\u00edmica (contaminants), per\u00f2 tamb\u00e9 d\u2019atacs interns (c\u00e8l\u00b7lules canceroses). No obstant aix\u00f2, no \u00e9s perfecte; a vegades no funciona, a vegades s\u2019equivoca, i a vegades els agressors poden m\u00e9s, i apareixen les malalties.<\/p>\n<p>En aquest article et parlarem de les generalitats del funcionament del sistema immunitari i del que passa quan el sistema immunitari falla.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Contenido de la p\u00e1gina<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #333333;color:#333333\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #333333;color:#333333\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/salut\/com-funciona-sistema-immunitari\/#mecanismes-del-sistema-immune-la-immunitat-innata\" >Mecanismes del sistema immune: la immunitat innata<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/salut\/com-funciona-sistema-immunitari\/#mecanismes-del-sistema-immune-les-primeres-barreres\" >Mecanismes del sistema immune: les primeres barreres<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/salut\/com-funciona-sistema-immunitari\/#mecanismes-del-sistema-immune-la-immunitat-innata-cellular\" >Mecanismes del sistema immune: la immunitat innata cel\u00b7lular<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/salut\/com-funciona-sistema-immunitari\/#mecanismes-del-sistema-immune-la-immunitat-adaptativa\" >Mecanismes del sistema immune: la immunitat adaptativa<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/salut\/com-funciona-sistema-immunitari\/#com-funcionen-els-anticossos\" >Com funcionen els anticossos?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/salut\/com-funciona-sistema-immunitari\/#on-ocorren-totes-aquestes-reaccions-del-sistema-immunitari\" >On ocorren totes aquestes reaccions del sistema immunitari?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/salut\/com-funciona-sistema-immunitari\/#i-amb-aquest-sistema-immunitari-per-que-ens-emmalaltim\" >I amb aquest sistema immunitari per qu\u00e8 ens emmalaltim?<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"mecanismes-del-sistema-immune-la-immunitat-innata\"><\/span>Mecanismes del sistema immune: la immunitat innata<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>La immunitat innata \u00e9s el conjunt de processos del sistema immune que permet muntar una defensa contra qualsevol atac de forma no espec\u00edfica. La immunitat innata munta la mateixa defensa contra un bacteri que contra una altra, o contra una toxina o una altra, perqu\u00e8 reconeix que hi ha \u00abuna cosa diferent\u00bb en el nostre cos i desplega el seu atac. Aix\u00f2 permet una reacci\u00f3 molt r\u00e0pida, per\u00f2 no genera protecci\u00f3 a llarg termini.<br \/>\nLa immunitat innata compta amb un sistema de barreres i amb un sistema cel\u00b7lular complex.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"mecanismes-del-sistema-immune-les-primeres-barreres\"><\/span>Mecanismes del sistema immune: les primeres barreres<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>La immunitat innata compta amb tres tipus de barreres, que s\u00f3n la primera defensa del nostre cos. S\u00f3n les:<\/p>\n<ul>\n<li>Barreres f\u00edsiques. Els pulmons expulsen part\u00edcules a trav\u00e9s de la tos, les ll\u00e0grimes i l\u2019orina arrosseguen part\u00edcules invasores\u2026 i aix\u00ed amb tots els punts d\u2019acc\u00e9s del nostre cos.<\/li>\n<li>Barreres qu\u00edmiques. La suor, les ll\u00e0grimes, la saliva, i b\u00e0sicament tots els fluids en contacte amb l\u2019exterior tenen algun enzim, metall, o producte \u00e0cid per a atacar qu\u00edmicament als potencials agressors.<\/li>\n<li>Barreres biol\u00f2giques. Gaireb\u00e9 tot el que est\u00e0 en contacte amb el mitj\u00e0 extern t\u00e9 una flora bacteriana pr\u00f2pia que impedeix que els pat\u00f2gens accedeixin f\u00e0cilment als nostres teixits. Entre els llocs anat\u00f2mics m\u00e9s rics en bacteris tenim la pell, la boca, l\u2019intest\u00ed i la vagina.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"mecanismes-del-sistema-immune-la-immunitat-innata-cellular\"><\/span>Mecanismes del sistema immune: la immunitat innata cel\u00b7lular<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Les defenses cel\u00b7lulars de la immunitat innata s\u2019activen quan un senyal bioqu\u00edmic indica que \u00e9s necessari muntar una defensa. Per exemple, quan hi ha una ferida les plaquetes s\u00f3n les c\u00e8l\u00b7lules que \u00abreparen\u00bb la ferida, per\u00f2 tamb\u00e9 estan entre les primeres a segregar mol\u00e8cules que activen la immunitat innata.<\/p>\n<p>Com elimina la immunitat innata als pat\u00f2gens? B\u00e0sicament a trav\u00e9s de:<\/p>\n<ul>\n<li>Atac qu\u00edmic. Algunes c\u00e8l\u00b7lules de defensa s\u00f3n capaces d\u2019ingressar pat\u00f2gens al seu interior (fagocitosi) on l\u2019ataquen amb enzims destructius i amb qu\u00edmics potents com el per\u00f2xid d\u2019hidrogen o l\u2019hipoclorit (quan els humans els venem en ampolla es diu \u00abaigua oxigenada\u00bb i \u00ablleixiu\u00bb respectivament). Si el patogen no pot ser fagocitat per la seva naturalesa o grand\u00e0ria, tamb\u00e9 es pot secretar productes cap a l\u2019exterior.<\/li>\n<li>Atac cel\u00b7lular. Tenim c\u00e8l\u00b7lules de defensa capaces de recon\u00e8ixer si una de les nostres pr\u00f2pies c\u00e8l\u00b7lules va ser infectada o alterada d\u2019alguna manera, matant-la.<\/li>\n<li>Activaci\u00f3 del sistema del complement. El sistema del complement \u00e9s un conjunt de reaccions qu\u00edmiques altament coordinades que, en aquest punt, permet destruir alguns tipus de bacteris per lisis (b\u00e0sicament \u00abrebenten\u00bb).<\/li>\n<\/ul>\n<p>Per a portar endavant aquesta defensa intervenen diversos tipus cel\u00b7lulars (neutr\u00f2fils, macr\u00f2fags, mon\u00f2cits, c\u00e8l\u00b7lules&nbsp;NK&nbsp;i diverses m\u00e9s) i m\u00e9s de 50 prote\u00efnes de comunicaci\u00f3 i regulaci\u00f3.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"mecanismes-del-sistema-immune-la-immunitat-adaptativa\"><\/span>Mecanismes del sistema immune: la immunitat adaptativa<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Per\u00f2 el nostre cos no es conforma amb la immunitat innata, sin\u00f3 que t\u00e9 mecanismes per a respondre espec\u00edficament contra un determinat patogen. Aquest mecanisme demora m\u00e9s a activar-se, per\u00f2 a canvi confereix protecci\u00f3 al llarg del temps. Es basa en l\u2019exist\u00e8ncia de limf\u00f2cits B i limf\u00f2cits T:<\/p>\n<ol>\n<li>Els limf\u00f2cits tenen informaci\u00f3 gen\u00e8tica per a sintetitzar \u00abdetectors\u00bb de mol\u00e8cules, i cada limf\u00f2cit fa el seu propi i \u00fanic detector. Podem fer detectors contra gaireb\u00e9 tot el que se\u2019ns ocorri: mol\u00e8cules provinents de virus, de bacteris, de plantes, de pell de gos, del nostre cos, etc. Les mol\u00e8cules susceptibles de ser detectades reben el nom d\u2019ant\u00edgens.<\/li>\n<li>A l\u2019inici de la infecci\u00f3 algunes c\u00e8l\u00b7lules de la immunitat innata (com les c\u00e8l\u00b7lules dendr\u00edtiques) presenten ant\u00edgens&nbsp;provinents&nbsp;de pat\u00f2gens als limf\u00f2cits T. El limf\u00f2cit T amb el \u00abdetector\u00bb adequat reconeix a l\u2019antigen, es multiplica i madura, generant-se els limf\u00f2cits T citot\u00f2xics i els limf\u00f2cits T cooperadors. El limf\u00f2cit T citot\u00f2xic \u00e9s capa\u00e7 de matar c\u00e8l\u00b7lules infectades, mentre que el limf\u00f2cit T cooperador regula moltes reaccions del sistema immune.<\/li>\n<li>Enfront de l\u2019est\u00edmul dels limf\u00f2cits T cooperadors els limf\u00f2cits B amb el \u00abdetector\u00bb adequat segregaran anticossos.<\/li>\n<li>Finalment, alguns limf\u00f2cits B i T cooperadors seran capa\u00e7os d\u2019evolucionar a c\u00e8l\u00b7lules de mem\u00f2ria, capaces d\u2019activar-se r\u00e0pidament si torna a produir-se una infecci\u00f3 pel mateix patogen.<\/li>\n<\/ol>\n<p>Hem resumit els processos m\u00e9s \u00ablineals\u00bb de la immunitat adaptativa, per\u00f2 en realitat \u00e9s bastant m\u00e9s complex que aix\u00f2. Existeixen tipus cel\u00b7lulars que no hem esmentat, i tamb\u00e9 molt\u00edssims mecanismes d\u2019estimulaci\u00f3, de regulaci\u00f3, d\u2019inhibici\u00f3 i fins i tot de selecci\u00f3 de c\u00e8l\u00b7lules \u00fatils. Sense ells no seria possible la comunicaci\u00f3 intercel\u00b7lular, ni el control de la proliferaci\u00f3 cel\u00b7lular, ni la detenci\u00f3 de les reaccions quan ja s\u2019ha controlat la infecci\u00f3.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"com-funcionen-els-anticossos\"><\/span>Com funcionen els anticossos?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Els anticossos s\u00f3n mol\u00e8cules proteiques (immunoglobulines o&nbsp;Ig) segregades pels limf\u00f2cits B. S\u00f3n capa\u00e7os d\u2019unir-se a un antigen espec\u00edfic provinent d\u2019un patogen, i compleixen aquestes funcions:<\/p>\n<ul>\n<li>Neutralitzaci\u00f3 de la capacitat infectiva de pat\u00f2gens.<\/li>\n<li>Neutralitzaci\u00f3 de toxines.<\/li>\n<li>Marcaci\u00f3 de pat\u00f2gens per a la seva destrucci\u00f3 pel sistema del complement.<\/li>\n<li>Marcaci\u00f3 de pat\u00f2gens per a la seva destrucci\u00f3 per fagocitosi.<\/li>\n<\/ul>\n<p>En interaccionar amb el complement i amb la fagocitosi la immunitat adaptativa s\u2019uneix a la immunitat innata, tancant el cercle de les nostres defenses.<br \/>\nExisteixen cinc tipus d\u2019anticossos en el nostre organisme: IgM, IgG, IgA, IgE i&nbsp;IgD. Depenent del moment respecte al contagi o del lloc anat\u00f2mic a defensar trobarem els uns o els altres.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"on-ocorren-totes-aquestes-reaccions-del-sistema-immunitari\"><\/span>On ocorren totes aquestes reaccions del sistema immunitari?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>El sistema immunitari est\u00e0 compost per diversos \u00f2rgans:<\/p>\n<ul>\n<li>\u00d2rgans&nbsp;primaris: s\u00f3n la medul\u00b7la \u00f2ssia (on se sintetitzen les c\u00e8l\u00b7lules de defensa i on maduren els limf\u00f2cits B) i l\u2019estafa (on els limf\u00f2cits T maduren).<\/li>\n<li>\u00d2rgans secundaris: s\u00f3n la melsa, els ganglis limf\u00e0tics i el teixit limf\u00e0tic associat a mucoses. S\u00f3n els \u00f2rgans en els quals es produeixen diverses de les interaccions que t\u2019expliquem en els par\u00e0grafs anteriors.<\/li>\n<\/ul>\n<p>Finalment, la majoria de les c\u00e8l\u00b7lules involucrades en aquestes reaccions es mouen per tot el cos a trav\u00e9s de la sang i de la limfa, i poden a m\u00e9s sortir cap als teixits danyats; aix\u00ed, s\u00f3n capa\u00e7os de muntar una defensa all\u00ed on s\u2019est\u00e0 produint la invasi\u00f3.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"i-amb-aquest-sistema-immunitari-per-que-ens-emmalaltim\"><\/span>I amb aquest sistema immunitari per qu\u00e8 ens emmalaltim?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Per diverses raons:<\/p>\n<ul>\n<li>\u00c9s possible que moment\u00e0niament el nostre sistema immune es vegi desbordat, per\u00f2 eventualment controla la malaltia. Pensa en els refredats o les diarrees&nbsp;autolimitades: encara que passem uns dies amb s\u00edmptomes el sistema immune eventualment actua i ens curem.<\/li>\n<li>Alguns \u00e9ssers s\u2019escapen de les nostres defenses. El bacteri de la tuberculosi t\u00e9 un recobriment que li permet resistir gaireb\u00e9 qualsevol dels nostres atacs, el virus de la grip muta i no podem generar mem\u00f2ria contra ell, el VIH ataca els limf\u00f2cits T col\u00b7laboradors i bloqueja tots els processos que aquests limf\u00f2cits regulen, els par\u00e0sits disminueixen les reaccions del sistema immune al seu voltant, les c\u00e8l\u00b7lules&nbsp;canceroses&nbsp;s\u2019adapten a sobreviure en pres\u00e8ncia del sistema immune i fins i tot l\u2019enganyen i l\u2019usen&nbsp;a favor seu\u2026 i aix\u00ed varis.<\/li>\n<li>El sistema immune requereix un bon estat nutricional per a funcionar. Les <a href=\"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/vitamines\/vitamines-i-minerals-per-al-sistema-immunitari\/\">dietes pobres en prote\u00efnes, en minerals o en vitamines<\/a>&nbsp;poden fer que el sistema immune no funcioni correctament.<\/li>\n<li>El sistema immune pot fallar, atacant mol\u00e8cules pr\u00f2pies. Hem parlat de les <a href=\"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/salut\/que-son-les-malalties-autoimmunes\/\">malalties autoimmunes<\/a> en aquest article.<\/li>\n<li>Alguns medicaments impedeixen el correcte funcionament del sistema immune, portant a situacions d\u2019immunosupressi\u00f3. Aix\u00f2 pot ser desitjable o pot ser un efecte advers; en qualsevol cas, ens deixa m\u00e9s sensible a les infeccions.<\/li>\n<\/ul>\n<p>Si desitges saber m\u00e9s sobre un <a href=\"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/salut\/com-podem-reforcar-el-nostre-sistema-immunitari\/\">sistema immunitari fort<\/a>, pots llegir aquest article.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>El sistema immunitari, immunol\u00f2gic o immune \u00e9s el conjunt d\u2019\u00f2rgans, c\u00e8l\u00b7lules i processos que s\u2019encarreguen de protegir al nostre organisme d\u2019atacs exteriors, mantenint un equilibri que ens permet continuar funcionant correctament. \u00c9s capa\u00e7 de defensar-nos d\u2019atacs externs de naturalesa biol\u00f2gica (virus, bacteris, par\u00e0sits), f\u00edsica (radiacions) o qu\u00edmica (contaminants), per\u00f2 tamb\u00e9 d\u2019atacs interns (c\u00e8l\u00b7lules canceroses). No [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":17946,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"_mbp_gutenberg_autopost":false,"footnotes":""},"categories":[4,1,1,4],"tags":[],"class_list":["post-16506","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-respostes-de-salut","category-salut"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Com funciona el sistema immunitari? | farm\u00e0cies ecoceutics<\/title>\n<meta name=\"description\" content=\"El sistema immunitari \u00e9s el conjunt d&#039;\u00f2rgans, c\u00e8l\u00b7lules i processos que s&#039;encarreguen de protegir el nostre organisme d&#039;atacs exteriors.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ecoceutics.com\/ca\/respostes-de-salut\/salut\/com-funciona-sistema-immunitari\/\" \/>\n<meta property=\"og:locale\" content=\"ca_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Com funciona el sistema immunitari? 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