1 / 4

Fiziologia cresterii

Fiziologia cresterii. Doua Etape de crestere rapida : in primul an de viata la pubertate , mai precoce la fete Determinata genetic + factori :

carr
Download Presentation

Fiziologia cresterii

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Fiziologiacresterii DouaEtape de crestererapida: in primul an de viatala pubertate, maiprecoce la fete Determinatagenetic + factori: 1 . Exogeni: alimentatia!!!proteine , aaesentiali, vitamine, minerale+ aportcaloric:glucide, lipide) ; bolileinfectioase 2.Endogeni-HORMONI 1.STH : hipofizectomiasisteazacresterea +STH +hormonitiroidieni-!!! Se reiacresterea HT potenteazaactiuneasomatomedine 2.Hormonii tiroidieni :favorizeazasinteza de STH simARN in celulehipofizare. HT in exces !! Catabolism ROL: crestereadintilor; osificareacartilajelor;dezvoltareaproportionala organism; maturareaexpresieifete. 3.Insulina: anabolism !! Diabetzaharat la copiltratament cu insulina. 4.H.sexuali-androgeni puseu de crestere la pubertate EFECT ANABOLiZANTproteic ; Accelerareacrestreriila pubertatesecretiaandogeni din CSR; STH; IGF. H.Androgeniinitiazacresterea la pubertate + osificareacartilajelordecrestere 5. Estrogenidoze micistimuleazacresterea ; in doze mariinhibacresterea 6.H.gliococorticoizi: inhibacresterea: catabolism proteic :inhibaactivitateasomatomedinelor

  2. HIPOFIZA POSTERIOARAnu are structura de” glanda”-terminatiinervoase , celulegliale, capilare,tesutconjunctivADH,oxitocina-9 aa; 1000dalt. • Nucleiisupraoptici –paraventriculari-neuronimagnocelulari –tract hipotalamohipofizarsecreta ADH , oxitocina-granule de secretia in neuroni -tract hipotalamohipofizar–transport axoplasmatic – potentiale de actiune-exocitoza Ca++ dependenta • Stimulare-stimulareazoneimamelonare-eliberare de Oxitocina –crestereapresiunii in canalelegalactofore –ejectialaptelui • Stimulareaneuronisecretorivasopresina –hipovolemie- descarcare FAZICA se impulsuri –descarcareprelungita de ADH • In granule hormonisi un polipeptidNeurofizina???-precusor de hormoni; carauspentruhormoni • ADH—echlibrulhidric+ reglarea TA –efectevasoconstrictoare • RECEPTORI : V1 mediazavasoconstrictia; Ca-calmodulina; V2 celulatubulararenala –cAMP-crestereapermeabilitaiipentruapa

  3. Reglareasecretia de ADH • -Stimulosmotici-cresterea PO >285mosm/l –stimulareaosmoreceptorilor din hipotalamus-secretia de ADH-reabsorbtia de apa –restabilesteechilibrul osmotic +stimulareaCentrulSetei- ingestia de apa- scadepresiuneaosmotica • -Variatiavolumulsanguin- crestereavolemie- distensiaatriilor-n X-bulb- hipotalamus-inhibasecretia de ADH-crestediureza- scadevolemia • Expunere la frig- scade ADH- vasoconstrictie – afuxvenoscrescut-crestediureza Ortostatism,hipovolemie- crestesecretia de ADH -scadediureza -Angiotensina II –stimuleazacentrulsetei- crestesecretia de ADH

  4. OXITOCINA • Oxus-rapid; tokos-nastere • 1.contractia musculaturii uterine :declanseaza contractile uterine la nastere; stimulareazoneimamelonare+ coluluiuterincrestesecretia de oxitocina-contractiamusculaturii uterine • Sensibilitateamusculaturii uterine la oxitocina –creste-estrogeni; scade la progesteron • 2.contractia celulelormioepitelialedin canalelegalactofore-ejectialaptelui

More Related