Video: Dab tsi yog lub luag haujlwm tseem ceeb ntawm phospholipid bilayer hauv cellular membrane?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Lipid Bilayer Qauv
Cov lipid bilayer yog ib tug universal tivthaiv ntawm tag nrho cov cell daim nyias nyias . Nws luag hauj lwm Nws yog ib qho tseem ceeb heev vim hais tias nws cov yam ntxwv ntawm lub cev muab lub barrier uas cim cov ciam teb ntawm ib tug cell. Cov qauv hu ua "lipid bilayer "vim tias nws yog tsim los ntawm ob txheej ntawm cov roj ntsha hauv ob daim ntawv.
Tom qab ntawd, ib tus tuaj yeem nug, dab tsi yog lub luag haujlwm tseem ceeb ntawm phospholipid bilayer hauv cellular membrane?
Phospholipid bilayers yog cov khoom tseem ceeb ntawm cell daim nyias nyias . Cov lipid daim tawv nqaij ua raws li kev thaiv kev nkag mus ntawm molecules thiab ions mus rau hauv thiab tawm ntawm lub cell . Txawm li cas los xij, ib qho tseem ceeb muaj nuj nqi ntawm cell membrane yog tso cai rau kev xaiv ntawm qee yam tshuaj mus rau hauv thiab tawm ntawm lub hlwb.
Tsis tas li ntawd, dab tsi yog qhov loj phospholipid pom nyob rau hauv cell membranes? Plaub loj phospholipids predominate nyob rau hauv lub plasma daim nyias nyias ntawm ntau hom tsiaj hlwb phosphatidylcholine, phosphatidylcholine, phosphatidylserine, thiab sphingomyelin.
Ib yam li ntawd, nws raug nug, dab tsi yog tsim los ntawm phospholipid bilayer?
Cov lipid daim tawv nqaij (los yog phospholipid bilayer ) yog ib daim nyias nyias nyias ua ntawm ob txheej ntawm lipid molecules. Tshuaj lom neeg bilayers feem ntau yog tsim ntawm amphiphilic phospholipids uas muaj lub taub hau hydrophilic phosphate thiab tus Tsov tus tw hydrophobic muaj ob txoj hlua fatty acid.
Tus qauv ntawm cov cell membrane yog dab tsi?
Cov cell membrane , tseem hu ua plasma daim nyias nyias , yog ob txheej ntawm lipids thiab cov proteins uas nyob ib puag ncig a cell thiab cais cov cytoplasm (cov ntsiab lus ntawm cov cell ) los ntawm nws ib puag ncig. Nws yog selectively permeable, uas txhais tau hais tias nws tsuas yog cia tej molecules nkag thiab tawm.
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