Video: Membrane channel ua dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Membrane channels yog ib tsev neeg ntawm kev lom neeg daim nyias nyias cov proteins uas tso cai rau kev txav mus los ntawm ions (ion cov channel ), dej (aquaporins) los yog lwm yam kuab tshuaj kom passively hla lub daim nyias nyias down lawv electrochemical gradient. Lawv yog kawm siv ntau yam channelomics sim thiab lej cov tswv yim.
Yog li ntawd, dab tsi yog membrane channels?
Transmembrane channels . Transmembrane channels , kuj hu membrane channels , yog pores nyob rau hauv ib tug lipid bilayer. Cov cov channel tuaj yeem tsim los ntawm cov protein complexes uas khiav thoob plaws lub daim nyias nyias los yog peptides. Lawv tuaj yeem hla lub cell daim nyias nyias , txuas lub cytosol, los yog cytoplasm, mus rau lub extracellular matrix.
Kuj Paub, cov membrane channel puas xav tau lub zog? Txhua molecule muaj ib tug tshwj xeeb carrier protein uas pab lub molecule nyob rau hauv lub cell daim nyias nyias . Muaj ob hom kev thauj uas siv channel cov proteins. Thawj hom ua tsis yog xav tau lub zog kom txav cov khoom hla lub cell daim nyias nyias . Qhov no yog hu ua facilitated diffusion.
Nyob rau hauv no hais txog, dab tsi yog ib qho piv txwv ntawm ib tug membrane channel?
Membrane channels suav nrog cov proteins transmembrane uas tsim tau a channel pore. Cov channel pore tso cai rau kev nkag ntawm cov molecules (feem ntau hydrophilic) los ntawm nws. Rau piv txwv , cov qauv ntawm nicotinic hom acetylcholine receptors muaj 5 peptide subunits, uas ua ke tsim lub hauv paus pore.
Lub luag haujlwm tseem ceeb ntawm lub cell membrane yog dab tsi?
Cov qauv ntawm Plasma Membranes Cov lub luag haujlwm tseem ceeb ntawm plasma daim nyias nyias yog los tiv thaiv cell los ntawm nws ib puag ncig. Ua los ntawm ib tug phospholipid bilayer nrog embedded proteins, lub plasma daim nyias nyias yog xaiv permeable rau ions thiab organic molecules thiab tswj kev txav ntawm cov khoom hauv thiab tawm ntawm hlwb.
Pom zoo:
Vim li cas cell membrane tseem hu ua plasma membrane?
Lub plasma yog 'sau' ntawm lub cell, thiab tuav lub cell lub organelles. Yog li, cov txheej txheem sab nraud ntawm lub cell yog qee zaum hu ua cell membrane thiab qee zaum hu ua plasma membrane, vim tias qhov ntawd yog qhov sib cuag nrog. Yog li ntawd, tag nrho cov cell yog surrounded los ntawm ib tug plasma membrane
Dab tsi channel yog ntws dej hiav txwv?
National Geographic
Dab tsi yog qhov sib txawv ntawm cov channel gated?
Muaj peb lub ntsiab ntawm ion channel, i.e., voltage-gated, extracellular ligand-gated, thiab intracellular ligand-gated nrog rau ob pawg ntawm lwm yam ion channels
Dab tsi yog hom ion channel?
Ntau hom ion channel tau piav qhia: cov kev teb rau hluav taws xob (voltage-dependent ion channels), mechanical, lossis chemical (ligand-gated ion channels) stimuli; ion raws tswj los ntawm phosphorylation / dephosphorylation mechanisms; thiab G protein-gated ion channels
Channel mediated transport yog dab tsi?
Kev thauj mus los nruab nrab yog hais txog kev thauj mus los los ntawm kev thauj mus los ntawm cov protein. Nws yog ib qho uniport system vim hais tias nws tshwj xeeb thauj cov piam thaj hauv ib qho kev taw qhia, nqes nws cov concentration gradient hla lub cell membrane