{"id":81248,"date":"2018-05-16T13:14:34","date_gmt":"2018-05-16T13:14:34","guid":{"rendered":"http:\/\/humanitasnet-new.local\/enciclopedia\/oasele-lungi\/"},"modified":"2018-05-16T13:14:34","modified_gmt":"2018-05-16T13:14:34","slug":"oasele-lungi","status":"publish","type":"enciclopedia","link":"https:\/\/humanitas-net.humweb.webiz.team\/ro\/wiki\/oasele-lungi\/","title":{"rendered":"Oasele lungi"},"content":{"rendered":"<h2 id=\"ce-sunt-oasele-lungi\">Ce sunt oasele lungi?<\/h2>\n<p>Oasele sunt o form\u0103 de \u021besut conjunctiv extrem de specializat, const\u00e2nd dintr-un amestec de matrice organic\u0103 dens\u0103 \u0219i o component\u0103 mineral\u0103 anorganic\u0103. Acestea se caracterizeaz\u0103 prin duritatea \u0219i rezisten\u021ba lor mecanic\u0103. Oasele sunt segmente de forme, m\u0103rimi \u0219i densit\u0103\u021bi variate, toate la un loc form\u00e2nd scheletul.<\/p>\n<p>&nbsp;<\/p>\n<p>\u00cen func\u021bie de form\u0103, oasele pot fi \u00eemp\u0103r\u021bite \u00een oase lungi, oase plate, oase scurte \u0219i oase neregulate. Oasele lungi se dezvolt\u0103 \u00een principal \u00een lungime (cum ar fi femurul, tibia, peroneul, radius, cubitus, humerus); oasele plate sunt caracterizate prin faptul c\u0103 au o lungime \u0219i o l\u0103\u021bime mai mari dec\u00e2t grosimea (cum ar fi oasele craniului, omoplatul, sternul); oasele scurte sunt dezvoltate \u00eentr-un mod similar \u00een toate cele trei dimensiuni (cum ar fi carpienele \u0219i tarsienele); \u0219i oasele neregulate sunt caracterizate prin faptul c\u0103 nu au niciun element morfologic dominant (cum este cazul vertebrelor). \u00cen condi\u021bii normale, oasele se opresc din cre\u0219tere atunci c\u00e2nd o persoan\u0103 a atins adolescena t\u00e2rzie sau 25 de ani.<\/p>\n<p>&nbsp;<\/p>\n<p>Oasele lungi sunt oase tari, dense, care asigur\u0103 structura \u0219i mobilitatea. Femurul, tibia \u0219i peroneul sunt considerate oase lungi \u00een membrele inferioare, iar osul humerus, radius \u0219i cubitus sunt considerate oase lungi \u00een membrele superioare. Suprafa\u021ba oaselor lungi este acoperit\u0103 de periost, o membran\u0103 care leag\u0103 procesele responsabile de cre\u0219terea osoas\u0103 \u0219i formarea de calus \u00een fracturi. \u021aesutul osos compact (sau cortical), care este un strat de os dens, este localizat sub periost; iar sub acesta, este afl\u0103 \u021besutul osos spongios (sau trabecular), care con\u021bine m\u0103duv\u0103 osoas\u0103, responsabil\u0103 de producerea de celule sanguine.<\/p>\n<p>&nbsp;<\/p>\n<p>Un os lung are un arbore, sau partea central\u0103 a osului, cunoscut\u0103 sub numele de diafiz\u0103, \u0219i dou\u0103 capete, cunoscut\u0103 sub numele de epifize. La articula\u021bie, epifiza este acoperit\u0103 cu cartilaj articular, la r\u00e2ndul s\u0103u form\u00e2nd suprafe\u021be articulare. Oasele lungi sunt mai sub\u021biri \u00een centru, iar diametrul lor cre\u0219te pe m\u0103sur\u0103 ce subiectul se trece de la arbore la epifiz\u0103; zona dintre un cap\u0103t al arborelui \u0219i epifiza adiacent\u0103 este cunoscut\u0103 sub numele de metafiz\u0103. La copii \u0219i adolescen\u021bi, \u00eentre metafiz\u0103 \u0219i epifiz\u0103 este un cartilaj cunoscut sub numele de &#8220;conjugare&#8221;, care reprezint\u0103 aria de cre\u0219tere a lungimii acestui tip de oase. La adul\u021bi, metafiza este, \u00een schimb, complet osificat\u0103.<\/p>\n<p>&nbsp;<\/p>\n<p>Exist\u0103 dou\u0103 tulbur\u0103ri congenitale asociate cu oasele lungi. Rahitis fetalis anularis este o tulburare care apare c\u00e2nd se m\u0103resc capetele oaselor lungi (epifize). O alt\u0103 tulburare, cunoscut\u0103 sub numele de Rachitis fetalis micromelica, apare atunci c\u00e2nd exist\u0103 o deficien\u021b\u0103 de cre\u0219tere a oaselor.<\/p>\n<p>Calciul este o caracteristic\u0103 extrem de important\u0103 \u00een dieta unei persoane. Calciul consumat este stocat \u00een oase, ca un fel de depuneri minerale, care, la r\u00e2ndul lor, ajut\u0103 la construirea de oase mai puternice \u0219i mai s\u0103n\u0103toase.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<h2 id=\"ce-functie-indeplinesc-oasele-lungi\">Ce func\u021bie \u00eendeplinesc oasele lungi?<\/h2>\n<p>&nbsp;<\/p>\n<p>Oasele lungi \u00eendeplinesc diferite func\u021bii \u00een corpul uman:<\/p>\n<p>&nbsp;<\/p>\n<p>Interac\u021bion\u00e2nd cu mu\u0219chii \u0219i tendoanele, ele permit mi\u0219carea membrelor.<\/p>\n<p>Acestea ofer\u0103 rezisten\u021b\u0103, structur\u0103 \u0219i mobilitate la nivelul extremit\u0103\u021bilor superioare \u0219i inferioare.<\/p>\n<p>Ela lucreaz\u0103 ca p\u00e2rghii, permi\u021b\u00e2nd utilizarea la poten\u021bialul maxim pentru func\u021biile musculare (cum ar fi ridicarea obiectelor grele \u0219i mi\u0219carea rapid\u0103).<\/p>\n<p>Ca toate celelalte oase, ele reprezint\u0103 rezerve \u0219i depozite de minerale, cum ar fi calciu, fosfor, sodiu \u0219i magneziu, esen\u021biale pentru reglarea multor mecanisme fiziologice.<\/p>\n<p>M\u0103duva osoas\u0103 din ele este capabil\u0103 s\u0103 produc\u0103 celule sanguine ( globule albe, globule ro\u0219ii, trombocite).<\/p>\n","protected":false},"featured_media":0,"parent":0,"template":"","Example":[1792],"class_list":["post-81248","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>Oasele lungi - 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=\"Oasele lungi - Humanitas.net\" \/>\n<meta property=\"og:description\" content=\"Ce sunt oasele lungi? 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