Maitiro Ekugadzira Dumbu Chiropa
Chiropa chimwe chezvikamu zvinobatikana mumuviri wemunhu. Kuwedzera pabasa rayo mukubvisa tsvina mumuviri, kuchengetedza simba, uye kugadzirisa mashandiro emuviri, chiropa chinoitawo basa rakakosha, rinowanzo regeredzwa: kugadzira bile. Bile imvura inogaya chikafu inokosha pakubatsira muviri kugaya mafuta uye kunwa mamwe mavhitamini. Maitiro ekuumbwa kwebile haasi nyore; anosanganisira nzira dzakasiyana-siyana dzehupenyu, kubva pamasero kusvika kunzira yemudumbu. Chinyorwa chino chinokurukura kuti chiropa chinogadzira sei bile, zvikamu zvaro, kuti rinofamba sei kuenda muura, uye nei maitiro aya akakosha pahutano.
Chii chinonzi bile uye nei ichikosha?
Bile imvura yegirini-yero inoramba ichigadzirwa nechiropa. Basa rayo guru nderekusanganisa mafuta—kuaputsa kuita madonhwe madiki—kuitira kuti ma enzymes ekugaya chikafu (lipases) ashande zvakanaka. Pasina bile, kugaya mafuta hakuna kunaka, zvichiita kuti zviomere muviri kutora mafuta acids nemavhitamini anonyungudika mafuta akadai sevhitamini A, D, E, naK.
Kunze kwekubatsira kugaya, bile rinoshandawo senzira yekubvisa tsvina. Semuenzaniso, bilirubin (chinhu chinoparara chehemoglobin), cholesterol yakawandisa, uye zvimwe zvigadzirwa zvemetabolism nemishonga zvinogona kuburitswa kuburikidza nebile. Nokudaro, bile haringobatanidzwi chete mukugaya asiwo mu "kuchena" kwemuviri.
Zvikamu zvikuru zve bile
Bile harisi "mvura inogaya chikafu" chete, asi musanganiswa wakaoma une:
1. Munyu weBile: unobva muBile acids inogadzirwa necholesterol. Ndiwo chinhu chakakosha mukuwedzera mafuta mumuviri.
2. Phospholipids (kunyanya lecithin): inobatsira kugadzira micelles ine bile salts, zvichiita kuti mafuta anyure mumuviri.
3. Cholesterol: Imwe cholesterol inoburitswa munyongo. Yakawandisa inogona kukonzera kuumbwa kwematombo emunduru.
4. Bilirubin: ruvara runobva mukuputsika kwemasero matsvuku eropa, izvo zvinoita kuti bile rive neruvara rwaro.
5. Maelectrolyte nemvura: zvinoita kuti bile riwedzere mvura kuitira kuti rifambe zviri nyore nemumugero we bile.
6. Mapuroteni nezvimwe zvinhu: kusanganisira marara emuviri nezvimwe zvinhu zvinoda kuburitswa.
Maumbirwo enyongo anogona kuchinja zvichienderana nemamiriro emuviri, kudya, uye kushanda kwemahormone ekugaya chikafu.
Ndiani "anogadzira" nyongo muchiropa?
Bile rinogadzirwa nemasero echiropa anonzi hepatocytes. MaHepatocytes ndiwo akawanda ematishu echiropa uye anoshanda semafekitori ebiochemical. Anotora zvinhu zvakagadzirwa kubva muropa, ozvigadzirisa, uye obva agadzira bile, iro rinotakurwa nepamigero midiki iri muchiropa.
Pamusoro pehepatocytes, kunewo masero epithelial ari mumaducts e bile anonzi cholangiocytes. Macholangiocytes haagadzire bile kubva pakutanga semahepatocytes, asi "anochinja" bile - semuenzaniso, kuwedzera mvura nebicarbonate - kuitira kuti huwandu uye hunhu hwebile zvigone kugadziriswa kuti zvienderane nezvinodiwa pakugaya.
Matanho ekugadzira bile muchiropa
1. Kuumbwa kwe bile acids kubva mucholesterol
Danho rakakosha mukugadzirwa kwe bile kugadzirwa kwe bile acids. Bile acids inogadzirwa kubva mu cholesterol kuburikidza nekuita kwe enzymes mu hepatocytes. Imwe enzyme inokosha munzira iyi i cholesterol 7α-hydroxylase (CYP7A1), iyo inodzora huwandu hwe bile acid inogadzirwa.
Maasidhi e bile achangobva kugadzirwa anogona kusanganiswa (kusanganiswa) nemaamino acids akadai seglycine kana taurine. Maitiro aya ekubatanidza bile acids anoita kuti bile acids inyungudike mumvura uye ishande zvakanyanya mukubatsira kugaya mafuta. Mushure mekubatana, bile acids dzinobuda dzinowanzonzi bile salts.
2. Kuburitswa kwezvikamu zve bile mu bile canaliculi
Kana zvikamu zve bile zvaumbwa, ma hepatocytes anoaburitsa mumigero midiki inonzi bile canaliculi. Ma canaliculi aya ma "gutter" madiki ari pakati pema hepatocytes. Apa ndipo panotanga kuyerera bile.
Kuyerera kwenyongo kunoda kuti zvinhu zvakasiyana-siyana zvinotakura (transfer proteins) zvishande pa hepatocyte cell membrane. Munyu wenyongo, conjugated bilirubin, phospholipids, nezvimwe zvinhu zvinopombwa mu canaliculi. Kufamba kwezvinhu izvi kunokwezva mvura nema electrolytes, zvichiwedzera huwandu hwenyongo uye zvichiideredza zvakakwana kuti ibude.
3. Kugadziriswa kwe bile nemasero emudumbu
Dumbu rinotanga kugadzirwa nehepatocytes rinonzi primary bile. Parinopfuura nemuma intrahepatic bile ducts (ma bile ducts ari muchiropa), cholangiocytes inogona kuwedzera bicarbonate (HCO₃⁻) nemvura. Kuwedzerwa kwebicarbonate kunobatsira kuderedza acid yemudumbu sezvo zviri mudumbu zvichipinda mudumbu diki, zvichiita kuti nharaunda yemudumbu ive yakanakira basa rema enzymes ekugaya chikafu.
Mutemo uyu unoshandiswa nemahormone akadai se secretin, ayo anokurudzira ducts dze bile kuti dzigadzire mvura ine bicarbonate yakawanda.
4. Kuchengetwa uye kuwanda kwemasero munyongo
Kunyange zvazvo bile richigadzirwa nguva dzose, harisi nguva dzose rinoyerera zvakananga muura. Kana pasina chikafu, kunyanya chikafu chine mafuta, bile rinowanzoendeswa kugaro kuti richengetwe. Mugaro, bile rinoungana: mvura nemamwe ma electrolyte anotorwazve, zvichiita kuti bile rive rakakora uye rive nesimba kana zvichidikanwa.
5. Kuburitswa kwenyongo muura hudiki panguva yekudya
Kana uchidya, kunyanya chikafu chine mafuta, ura hwako hudiki hunoburitsa hormone inonzi cholecystokinin (CCK). Iyi hormone inoita kuti gallbladder iite clamp yoburitsa bile muduodenum, iyo inobva yapinda muduodenum (chikamu chekutanga cheura hudiki). Panguva imwe chete, CCK inobatsirawo kuzorodza sphincter yeOddi, "valve" inodzora kuyerera kwe bile nemajusi epancreatic muura.
Mushure mekunge bile yapinda muura hudiki, munyu we bile unoita basa rawo: kugadzira micelles, kusunga mafuta uye mavhitamini anonyunguduka mumafuta, wozotakura zvinhu zvekugaya kuenda pamusoro peura kuti zvinyudzwe.
Kutenderera kweropa: nyongo inoshandiswazve
Zvinofadza kuti muviri haubudisi munyu wese we bile mushure mekushandisa. Mizhinji yacho inotorwa zvakare muchikamu chekupedzisira cheura hudiki (ileum) yoendeswa kuchiropa kuburikidza netsinga yemusana. Maitiro aya anonzi enterohepatic circulation.
Kutenderera uku kunoshanda zvikuru. Munyu wemudumbu unogona kushandiswazve kakawanda pazuva. Chiropa chinongoda kugadzira zvidimbu zvidiki zvemudumbu kuti zvitsive zvinorasika mutsvina. Sisitimu iyi yekudzokorodza inobatsira muviri kuchengetedza simba uye kuchengetedza munyu wemudumbu uripo kuti ugayiwe.
Chii chinoitika kana kugadzirwa kwenyongo kana kuyerera kwayo kukakanganiswa?
Kukanganiswa kwekugadzirwa kana kuyerera kwenyongo kunogona kukonzera matambudziko akasiyana-siyana ehutano, semuenzaniso:
– Cholestasis (kuvharika kwekufamba kwenyongo): inogona kukonzera kuunganidzwa kwebilirubin nemunyu wenyongo muropa, zvichikonzera ganda rinokwenya, weti yakasviba, tsvina yakachenuruka, uye jaundice.
– Matombo emudumbu: anowanzo umbwa kana bile rakazara necholesterol yakawanda kana paine kusaenzana kwezvinoumba bile.
– Kusakwanisa kunwa mafuta: kushaya bile kunogona kukonzera tsvina ine mafuta (steatorrhea) uye kushomeka kwemavhitamini A, D, E, K.
– Kukuvadzwa kwechiropa kana duct ye bile: zvakaita sehepatitis, cirrhosis, kana kuzvimba kweduct ye bile kunogona kukanganisa kugadzirwa/kutakurwa kwebile.
Nekuti bile rinobatanidzwa mukugaya chikafu uye kubvisa tsvina, matambudziko ehurongwa hwenyongori anowanzo kukanganisa zvakanyanya, kwete dumbu chete asiwo mamiriro eganda, simba, uye kugaya chikafu.
Penutup
Kugadzirwa kwenyongo nechiropa inzira inobatanidzwa zvakanyanya. Hepatocytes inogadzira bile acids kubva mucholesterol, inoburitsa bile salts nezvimwe zvinhu zvakasiyana-siyana mubile canaliculi, uye yozochinja bile iri mumigero yenyongo isati yachengetwa uye yakabatana munduru. Kana chikafu chine mafuta chikadyiwa, bile inoburitswa muura hudiki kuti ibatsire mukugaya mafuta uye kunwa mavhitamini. Mushure mekushandisa, yakawanda yenyongo inodzokororwa kuburikidza neropa rinoyerera.
Kunzwisisa kuti chiropa chinoburitsa sei bile kunotibatsira kuona kuti nhengo iyi haisi "toxin filter" chete, asi inodzora kugaya chikafu nekudya. Kuchengetedza hutano hwechiropa kuburikidza nekudya zvine mwero, kuita maekisesaizi, uye kuongororwa hutano kana uine matambudziko ekugaya chikafu kana zviratidzo zvejaundice matanho akakosha ekuona kuti nyongo inoshanda zvakanaka.
