Puas yooj yim diffusion siv cov proteins channel?
Puas yooj yim diffusion siv cov proteins channel?

Video: Puas yooj yim diffusion siv cov proteins channel?

Video: Puas yooj yim diffusion siv cov proteins channel?
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Kev Pom Zoo: Yooj yim Diffusion Cov neeg nqa khoom

Muaj ob hom yooj yim diffusion cov neeg nqa khoom: Channel cov protein thauj tsuas yog dej lossis qee yam ions. Lawv ua yog li los ntawm kev tsim ib protein ntau -lined passageway hla lub membrane. Ntau cov dej molecules los yog ions tuaj yeem hla hauv ib cov ntaub ntawv los ntawm xws li cov channel ntawm tus nqi ceev heev.

Tom qab ntawd, ib tug kuj yuav nug, hom protein twg yog siv los pab kom yooj yim diffusion?

channel cov protein

Dab tsi dhau los ntawm cov proteins channel? Ntau cov molecules them, uas yog hydrophilic, muaj lub sijhawm nyuaj hla dhau daim nyias nyias. Cov no suav nrog ions, dej, thiab suab thaj xws li qabzib. Channel cov protein nqa tawm feem ntau ntawm kev yooj yim diffusion. Cov cab kuj cov proteins ua haujlwm tsis muaj zog, thiab txav cov molecules cia lawv cov concentration gradient.

Hais txog qhov no, puas yog ion channel yooj yim diffusion?

Yooj yim diffusion ntawm ions Nws tshwm sim los ntawm cov proteins, los yog sib sau ua ke ntawm cov proteins, embedded nyob rau hauv lub plasma membrane. Cov proteins transmembrane no tsim cov dej puv channel los ntawm qhov uas ion tuaj yeem dhau nws cov concentration gradient. Qee hom gated ion channels : ligand-gated.

Yuav ua li cas cov carrier proteins ua hauj lwm nyob rau hauv yooj yim diffusion?

Carrier proteins yog membrane embedded cov proteins uas tso cai rau kev nkag ntawm cov molecules los yog ions hla ib daim nyias nyias, cia cov molecular lossis ionic concentration gradient (hauv lwm lo lus, ntawm yooj yim diffusion ). Carrier proteins kuj muaj cov chaw tshwj xeeb uas qhib thaum lub substrate khi rau lawv.

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