Dab tsi txiav txim siab permeability ntawm cell membrane?
Dab tsi txiav txim siab permeability ntawm cell membrane?

Video: Dab tsi txiav txim siab permeability ntawm cell membrane?

Video: Dab tsi txiav txim siab permeability ntawm cell membrane?
Video: Txoov Lis - Kev Txiav Txim Siab 2024, Kaum ib hlis
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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. Permeability Feem ntau nyob ntawm tus nqi hluav taws xob thiab polarity ntawm cov molecule thiab tsawg dua qhov molar loj ntawm cov molecule.

Kuj nug, yuav ua li cas yog cell membrane permeability thiab fluidity tswj?

Cells tswj Membrane Fluidity los ntawm Kho Membrane Lipid muaj pes tsawg leeg. Cov fluidity Ntawm qhov lipid bilayer sib txawv nrog qhov kub thiab txias. Hauv cov tsiaj nyeg, cov cholesterol nce daim nyias nyias packing kom txo tau membrane fluidity thiab permeability . Cov fatty acids tails ntawm phospholipids kuj cuam tshuam membrane fluidity.

Tsis tas li ntawd, dab tsi ua rau cov cell membrane semi permeable? Cell membranes yog semipermeable , uas txhais tau tias molecules tuaj yeem txav mus los ntawm lawv. Qhov no tseem ceeb heev rau hlwb kom ciaj sia. Osmosis yog qhov uas cov kuab tshuaj molecules (feem ntau yog dej) txav ntawm ib sab ntawm a cell membrane rau lwm tus. Qhov no tshwm sim vim hais tias cov concentration ntawm ib tug solute siab dua nyob rau hauv ib sab.

Ib yam li ntawd, dab tsi yog permeable rau cell membrane?

Cov plasma daim nyias nyias yog xaiv permeable ; hydrophobic molecules thiab me me polar molecules tuaj yeem cuam tshuam los ntawm lipid txheej, tab sis ions thiab cov polar loj molecules tsis tuaj yeem. Kev tsis sib xws daim nyias nyias Cov proteins ua kom cov ions thiab cov polar loj molecules hla mus daim nyias nyias los ntawm passive lossis active thauj.

Cov protein nyob qhov twg hauv cov cell membranes?

Peripheral membrane proteins yog pom nyob rau sab nraud thiab sab hauv ntawm daim nyias nyias , txuas nrog rau ib qho cov proteins los yog phospholipids. Tsis zoo li ib qho membrane proteins , peripheral membrane proteins tsis txhob lo rau hauv cov tub ntxhais hydrophobic ntawm lub daim nyias nyias , thiab lawv zoo li yuav ua tau yooj yim dua.

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