Basa reMicrovilli muMatumbu Madiki
Ura hudiki inhengo inokosha mukugaya chikafu, inoshanda senzvimbo huru yekunwa zvinovaka muviri. Mukugadzirwa kwayo kwakaoma, chimwe chezvinhu zvakakosha kuvapo kwe microvilli. Aya maumbirwo madiki, akafanana nebvudzi anobuda pamusoro pemasero e epithelial ari muura hudiki. Pasinei nehukuru hwavo hudiki, microvilli inoita basa guru mukuona kuti zvinovaka muviri zvinotorwa zvinobudirira kuchengetedza hutano hwese uye homeostasis mumuviri. Chinyorwa chino chinotarisa chimiro, mashandiro, uye kukosha kwe microvilli muura hudiki, ichiratidza mupiro wayo wakakosha mufiziyoloji yemunhu.
Maumbirwo eMicrovilli
Microvilli idiki diki diki yeplasma membrane ye enterocytes, inova masero anonyudza ari mudumbu remukati meura diki. Ichiumba chikamu che 'brashi border', ma projection aya akazara uye anoita kuti pamusoro pemucosal yeura diki paite sebhurashi pasi pe microscope. Microvil yega yega inotsigirwa nepakati pe actin filaments, iyo yakasungirirwa pa cytoskeleton yesero. Plasma membrane inofukidza microvillus yega yega yakashongedzwa nema enzymes akasiyana-siyana nema protein ekutakura akakosha pakunyudza zvinovaka muviri.
Mafilamenti eActin ari mukati me microvilli anobatanidzwa nemamwe mapuroteni akadai se fimbrin ne villin, ayo anopa rutsigiro rwechimiro uye kugadzikana. Kurongeka uku kwakarongeka uye kunochinja-chinja kunobvumira microvilli kuchengetedza chimiro chayo uku ichivandudza kugona kwayo kushanda. Kurongeka kwakasimba kwe microvilli kunowedzera zvakanyanya nzvimbo yepamusoro yeura hudiki, zvichibvumira kuratidzwa kwakanyanya kune chyme - huwandu hwemvura shoma hwechikafu chakagayiwa zvishoma chinopinda muura hudiki kubva mudumbu.
Mabasa Akakosha eMicrovilli
1. Nzvimbo Yakawedzerwa Inonyudza Mvura
Rimwe remabasa makuru e microvilli nderekuwedzera nzvimbo yeura diki. Kunyange hazvo ura diki pachahwo hwatova chubhu refu yakakombama, kuvapo kwe villi (zviratidziro zvakakura zvakafanana neminwe) uye microvilli zvinowedzera nzvimbo yepamusoro zvakanyanya. Nzvimbo iyi yakakura yakakosha nekuti inobvumira huwandu hwakawanda hwezvinovaka muviri kuti zvinyurwe panguva imwe chete. Nekuwedzera nzvimbo yepamusoro, microvilli inoita kuti muviri ugone kunwisa huwandu hwakawanda hwemavhitamini, maminerari, maamino acid, nezvimwe zvinovaka muviri kubva muchikafu chinodyiwa.
2. Basa reEnzymatic rekugaya chikafu
Rimwe basa guru re microvilli nderekuti rinoita kuti 'membrane digestion'. Plasma membrane ye microvilli yakazara nema enzymes ekugaya akadai se lactase, sucrase, uye maltase, pakati pemamwe. Ma enzyme aya akakosha padanho rekupedzisira rekugaya. Semuenzaniso, ma disaccharides akadai se sucrase anoputsa ma disaccharides (akadai se sucrose) muzvikamu zvavo zve monosaccharide (zvakadai se glucose ne fructose), izvo zvinogona kutorwa nema enterocytes. Basa iri re brush border enzyme rinokosha nekuti rinoita kuti zvinovaka muviri zviputswe kuita mayunitsi madiki, anogona kutorwa panzvimbo yekutorwa.
3. Kutakura Zvinovaka Muviri Zvisingasarudzwe Uye Zvinoshanda
Microvilli dzakakoshawo pakutakura zvinovaka muviri zvinosarudza uye zvinobudirira. Plasma membrane ye microvilli ine mapuroteni akasiyana-siyana anotakura zvinovaka muviri zvinoita kuti zvinovaka muviri zvikwanise kutorwa. Semuenzaniso, sodium-glucose co-transporters (SGLTs) ndiyo inokonzera kutorwa kweglucose negalactose kubva muura hwemukati. Saizvozvowo, amino acid transporters inobvumira kutorwa kweamino acids dzinokosha nedzisiri dzinokosha. Nzira idzi dzekutakura dzinoona kuti zvinovaka muviri zvinotorwa zvakanaka uye nenzira yakasarudzwa, zvichidzivirira kutambisa uye kuwedzera kukosha kwekudya kunotorwa kubva muchikafu.
4. Kudzivirira uye Kushanda Kwemuviri Wekudzivirira Kurwara
Kunyange hazvo basa guru re microvilli riri rekunwa zvinovaka muviri, rinoitawo basa mumabasa ekudzivirira muviri. Masero e epithelial ari muura hudiki ne microvilli yavo anoumba chipingamupinyi chakasimba chinodzivirira utachiona, chepfu, uye maantigen kuti asapinde muropa. Pamusoro pezvo, microvilli inogona kusangana nemasero ekudzivirira muviri ari mugut-associated lymphoid tissue (GALT), zvichibatsira kutanga mhinduro dzekudzivirira muviri kubva kuzvirwere zvinokuvadza. Basa iri rekudzivirira rakakosha pakuchengetedza hutano hwemudumbu nehwese, kudzivirira hutachiona, uye kubatsira mukutarisa nzira dzekudzivirira muviri dzemudumbu.
Migumisiro yezvirwere zveMicrovilli Dysfunction
Zvichienderana nebasa razvo guru, kusashanda zvakanaka kana kukuvara kwe microvilli kunogona kuva nemigumisiro yakakomba yezvirwere. Zvirwere zvakaita sechirwere checeliac, chirwere chemudumbu chinoputika (IBD), uye zvimwe zvirwere zvinogona kukonzera kupera simba kana kuparadzwa kwe microvilli, zvichikanganisa zvakanyanya kunwa kwezvinovaka muviri uye zvichikonzera malabsorption syndromes. Varwere vane zvirwere zvakadaro vanogona kuratidza zviratidzo zvakaita semanyoka, kudzikira uremu, kushomeka kwezvinovaka muviri, uye kushaya chikafu zvakakwana. Kunzwisisa mashandiro aripo e microvilli kusashanda zvakanaka kunogona kutungamira kune nzira dziri nani dzekuongorora nekurapa dzekugadzirisa zvirwere izvi uye kudzoreredza mashandiro emudumbu akajairwa.
mhedziso
Microvilli dzakakosha pachimiro nebasa reura hudiki, dzichiita basa guru mukumedzwa kwezvinovaka muviri, kugaya, uye kudzivirira immune system. Nekuwedzera zvakanyanya nzvimbo yepamusoro, kufambisa enzymes, uye kuona kuti zvinovaka muviri zvinofambiswa zvakanaka, microvilli inoita kuti muviri ukwanise kubvisa nekushandisa zvinovaka muviri zvakakosha kubva muchikafu. Uyezve, basa rayo mukugadzira chipingamupinyi chinodzivirira rinosimbisa kukosha kwayo mukuchengetedza hutano hwemudumbu nehwese. Kufambira mberi mukutsvagisa kuri kuramba kuchijekesa mashandiro akaomarara uye nzira dzekudzora microvilli, zvichipa nzira dzinovimbisa dzekurapa zvirwere zvemudumbu uye kuwedzera kumedzwa kwezvinovaka muviri. Kunzwisisa uye kukoshesa mashandiro akaomarara e microvilli kunosimbisa chinzvimbo chavo semagamba asina kurumbidzwa murwendo rwekugaya kwevanhu nekudya kunovaka muviri.
