{"id":81199,"date":"2018-05-16T10:43:23","date_gmt":"2018-05-16T10:43:23","guid":{"rendered":"http:\/\/humanitasnet-new.local\/enciclopedia\/sistemul-hematopoietic\/"},"modified":"2018-05-16T10:43:23","modified_gmt":"2018-05-16T10:43:23","slug":"sistemul-hematopoietic","status":"publish","type":"enciclopedia","link":"https:\/\/humanitas-net.humweb.webiz.team\/ro\/wiki\/sistemul-hematopoietic\/","title":{"rendered":"Sistemul hematopoietic"},"content":{"rendered":"<p>Sistemul hematopoietic este format din corpii responsabili pentru hematopoiez\u0103 sau de produc\u021bia elementelor celulare ale s\u00e2ngelui: globule ro\u0219ii, globule albe \u0219i trombocite. Pe durata dezvolt\u0103rii embrionare, aceast\u0103 func\u021bie este efectuat\u0103 \u00een splin\u0103, ficat \u0219i m\u0103duva osoas\u0103 \u0219i dup\u0103 na\u0219tere produc\u021bia acestor elemente este efectuat\u0103 de m\u0103duva osoas\u0103 \u0219i noduli limfatici. Elementele celulare furnizeaz\u0103 oxigen (globule ro\u0219ii), ini\u021biaz\u0103 coagularea (trombocite) \u0219i protejeaz\u0103 de microbi \u0219i antigeni (globule albe).<\/p>\n<h2 id=\"ce-este-sistemul-hematopoietic\">Ce este sistemul hematopoietic?<\/h2>\n<p>Organele hematopoietice formeaz\u0103 un sistem prin care corpul produce globule ro\u0219ii, globule albe \u0219i trombocite, adic\u0103 elementele s\u00e2ngelui.<\/p>\n<p>Globulele ro\u0219ii (eritrocite) constituie cea mai por\u021biune de celule ale s\u00e2ngelui. Acestea au o form\u0103 biconcav\u0103 \u0219i o membran\u0103 flexibil\u0103, care permite globulelor ro\u0219ii s\u0103 \u00ee\u0219i schimbe forma f\u0103r\u0103 a se rupe c\u00e2nd trec prin vasele de s\u00e2nge \u00eenguste sau capilare. Num\u0103rul de globule ro\u0219ii variaz\u0103 de la persoan\u0103 la persoan\u0103 conform v\u00e2rstei, sexului \u0219i s\u0103n\u0103t\u0103\u021bii.<\/p>\n<p>Globulele albe (leucocite) sunt prezente \u00een diferite forme \u0219i fiecare tip de leucocite este esen\u021bial sistemului imunitar. Aceste celule ajut\u0103 la lupta contra infec\u021biilor \u0219i inflama\u021biilor \u0219i produc anticorpi.<\/p>\n<p>Trombocitele sunt a treia categorie de celule \u0219i sunt cele mai mici. Sunt formate din celulele m\u0103duvei osoase, cunoscute ca megacariocite. Trombocitele sunt responsabile pentru \u00eenceperea procesului de reparare a vaselor de s\u00e2nge mici, afectate \u0219i producerea de substan\u021be care sunt esen\u021biale pentru coagulare.<\/p>\n<p>Principalul produc\u0103tor al acestor elemente este m\u0103duva osoas\u0103, localizat\u0103 \u00een vertebre, stern, coaste \u0219i omoplat. Printre globule albe, limfocitele sunt produse la nivelul glandelor limfatice, structurile sferice mici localizate \u00een diferite p\u0103r\u021bi ale corpului.<\/p>\n<p>Unii exper\u021bi cred c\u0103 sistemul hematopoietic includ un alt element, \u021besutul endotelial reticular, distribuit \u00een corp.<\/p>\n<h2 id=\"ce-functie-are-sistemul-hematopoietic\">Ce func\u021bie are sistemul hematopoietic?<\/h2>\n<p>Sistemul hematopoietic permite corpului re\u00eennoirea continu\u0103 a globulelor ro\u0219ii, trombocitelor \u0219i globulelor albe (granulocite, monocite \u0219i limfocite) din s\u00e2nge. Astfel, organismul poate avea elementele s\u00e2ngelui de care are nevoie, chiar dac\u0103 au o durat\u0103 de via\u021b\u0103 bine definit\u0103.<\/p>\n<p>De fapt, globulele ro\u0219ii, care permit transportul oxigenului la \u021besuturi \u0219i dioxidul de carbon la pl\u0103m\u00e2ni, au o durat\u0103 de via\u021b\u0103 de 120 zile, dup\u0103 care trebuie \u00eenlocuite. Alte elemente, cum ar fi neutrofile, tr\u0103iesc mai pu\u021bin \u0219i dup\u0103 \u0219ase ore trebuie \u00eenlocuite de noi elemente. \u00centreaga popula\u021bie de trombocite este \u00eenlocuit\u0103 \u00een medie la fiecare 9.9 zile.<\/p>\n<p>Celulele stem pluripotente sunt prezente \u00een m\u0103duva spin\u0103rii din care \u00ee\u0219i au originea diferite tipuri de celule. Celulele stem pluripotente pot fi formate din celule progenitoare de celule limfoide \u0219i celule stem mieloid, din care pot fi formate globule ro\u0219ii, megacariocite care vor forma trombocite, celule mast \u0219i mieoblast, care formeaz\u0103 granulocite (bazofile, neutrofile, eozinofile) \u0219i monocite.<\/p>\n<p>Diferi\u021bi factori \u0219i hormoni de cre\u0219tere regleaz\u0103 diferen\u021ba de celule.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"featured_media":0,"parent":0,"template":"","Example":[1792],"class_list":["post-81199","enciclopedia","type-enciclopedia","status-publish","hentry","enciclopedia_category-anatomie"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.3 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Sistemul hematopoietic - Humanitas.net<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sistemul hematopoietic - Humanitas.net\" \/>\n<meta property=\"og:description\" content=\"Sistemul hematopoietic este format din corpii responsabili pentru hematopoiez\u0103 sau de produc\u021bia elementelor celulare ale s\u00e2ngelui: globule ro\u0219ii, globule albe \u0219i trombocite. 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