Lub luag haujlwm ntawm ion twj tso kua mis yog dab tsi?
Lub luag haujlwm ntawm ion twj tso kua mis yog dab tsi?

Video: Lub luag haujlwm ntawm ion twj tso kua mis yog dab tsi?

Video: Lub luag haujlwm ntawm ion twj tso kua mis yog dab tsi?
Video: Tshuaj theem vim li cas thiaj tau nqi ?/ Siv kho mob dab tsi?/paris polyphylla use for? 2024, Kaum ib hlis
Anonim

muaj nuj nqi hauv hlwb

(los ntawm kev ua haujlwm ntawm ib ion twj , piv txwv li), lub solute yuav rov qab mus rau nws qub concentration thiab lub xeev ntawm siab dawb zog. Cov twj tsis tu ncua txav sodium ions tawm ntawm lub cell thiab poov tshuaj ions mus rau hauv lub cell.

Hais txog qhov no, lub twj tso kua mis ion ua dab tsi?

Ion twj tso kua mis yog electro-physical nqus tsev vacuum twj uas tshem cov pa roj tawm ntawm lawv ib puag ncig los ntawm kev tig lawv mus rau hauv cov khoom siv.

Ib yam li ntawd, ion twj tso kua mis yog dab tsi? P-class ion twj muaj cov transmembrane catalytic α subunit, uas muaj qhov chaw ATP-binding site, thiab feem ntau yog ib qho me me β subunit, uas tej zaum yuav muaj kev tswj xyuas. Ntau yam ntawm no twj yog tetramers muaj li ntawm ob α thiab ob β subunits.

Hauv qhov no, cov twj ion puas xav tau lub zog?

Cov protein pores no tsuas yog txav mus ions down lawv concentration gradient. Ion channels tau hais tias "passive" vim tsis yog zog (ATP) yog xav tau txhawm rau qhib cov protein, tsuas yog ligand lossis hloov pauv hauv qhov hluav taws xob. Ion twj tso kua mis Ntawm qhov tod tes, yog active proteins.

Lub twj tso kua mis ion thauj khoom li cas?

Cov twj siv lub zog pub dawb xws li ATP lossis lub teeb kom tsav lub thermodynamically nce toj thauj ntawm ions los yog molecules . Pump kev ua yog ib qho piv txwv ntawm active thauj . Channels, nyob rau hauv sib piv, pab ions ntws sai los ntawm daim nyias nyias nyob rau hauv ib tug downhill kev taw qhia.

Pom zoo: