Video: Peb txoj kev nkag siab ntawm membrane permeability tau hloov li cas txij li thaum?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Yuav ua li cas peb nkag siab ntawm membrane permeability hloov txij li thaum lub nrhiav pom aquaporins? -aquaporins tso cai rau cov dej ntau dhau los ntawm hydrophobic daim nyias nyias ntawm tus nqi ceev. Qee cov dej molecules pawg nyob ib ncig ntawm thiab solute molecules thiab tsis muaj peev xwm mus diffuse.
Yog li, dab tsi cuam tshuam rau daim nyias nyias permeability?
Cov permeability ntawm ib lub cell daim nyias nyias yog cuam tshuam los ntawm polarity, hluav taws xob nqi thiab molar loj ntawm cov molecules uas diffuse los ntawm nws. Cov txheej phosolipid uas ua rau lub cell daim nyias nyias kuj cuam tshuam nws permeability . Ib lub cell daim nyias nyias muaj ob txheej phosolipid.
Tsis tas li ntawd, qhov fluidity ntawm cell membranes tswj tau li cas? Yog hais tias unsaturated fatty acids yog compressed, lub "kinks" nyob rau hauv lawv tails thawb phospholipid molecules nyob ib sab mus, uas yuav pab tau. tswj fluidity hauv daim nyias nyias . Cov roj (cholesterol) ua haujlwm raws li qhov tsis muaj, tiv thaiv qhov kub thiab txias los ntawm inhibiting fluidity thiab tiv thaiv kom tsis txhob muaj qhov kub thiab txias ntau ntxiv fluidity.
Kuj paub yog, puas tuaj yeem permeability ntawm cell membrane hloov physiologically?
Xaiv hloov ntawm cell membrane permeability Cov dej molecules ua tau diffuse los ntawm cov pores thiab li no cov cell membrane permeability yog kho kom zoo. Nco ntsoov tias saponin ua tsis hla cell daim nyias nyias , yog li cov qauv intracellular, e.g. lub hnab ntawv nuclear, tsis zoo li yuav yog hloov los ntawm kev kho saponin.
Cell membrane permeability yog dab tsi?
Cov permeability ntawm a daim nyias nyias yog tus nqi ntawm passive diffusion ntawm molecules los ntawm lub daim nyias nyias . Cov molecules no hu ua permeant molecules. Vim lub cell daim nyias nyias hydrophobic xwm, me me hluav taws xob nruab nrab molecules dhau los ntawm daim nyias nyias yooj yim dua li them, cov loj loj.
Pom zoo:
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