Qhov sib txawv tseem ceeb ntawm qhov yooj yim diffusion thiab yooj yim diffusion yog qhov yooj yim diffusion tshwm sim yam tsis muaj kev koom tes ntawm cov channel los yog cov cab cov proteins thaum qhov yooj yim diffusion tshwm sim los ntawm cov channel lossis cov khoom nqa khoom.
Yooj yim diffusion yog txheej txheem uas thauj cov molecules los ntawm thaj chaw siab concentration mus rau thaj tsam ntawm qhov tsis tshua muaj siab. Nws tshwm sim raws qhov concentration gradient. Li no nws tsis siv zog. Thiab, cov txheej txheem no tuaj yeem piav qhia los ntawm txoj haujlwm yooj yim uas thaum koj qhib lub raj mis ntxhiab, nws cov ntxhiab tsw kis thoob plaws hauv chav los ntawm kev nthuav dav.
Ib yam li ntawd, yog tias koj muab tus cwj mem tso rau hauv lub khob ntim dej, cov xim yuav faib sib npaug hauv dej. Diffusion tsis tsuas yog tshwm sim hauv cov xwm txheej no, tab sis nws kuj tshwm sim hauv cov hlwb thiab. Txawm li cas los xij, qee zaum thaum cov molecules loj dua kis thoob plaws hauv daim nyias nyias, cov proteins uas cuam tshuam rau daim nyias nyias koom nrog cov txheej txheem diffusion. Nws raug xa mus rau raws li kev yooj yim diffusion, thiab nws txawv ntawm qhov yooj yim diffusion vim nws koom nrog cov membrane proteins uas yog channels los yog carrier proteins. Txawm li cas los xij, txij li ob qho tib si qhov yooj yim diffusion thiab yooj yim diffusion tshwm sim raws li qhov concentration gradient, ob txoj kev yog cov txheej txheem passive.
Dab tsi yooj yim yog dab tsi?
Yooj yim diffusion yog cov txheej txheem uas thauj cov molecules los ntawm thaj tsam ntawm cov concentration siab dua mus rau thaj tsam ntawm cov concentration qis hauv cov tshuaj lossis hla ib daim nyias nyias. Nws yog ib tug passive txheej txheem. Nyob rau hauv yooj yim diffusion, molecules tsiv tsis muaj kev pab los ntawm lwm yam molecules xws li cov proteins los yog channel los yog carrier proteins.
Daim duab 01: Yooj Yim Diffusion
Yooj yim diffusion passively tshwm sim kom txog thaum tag nrho cov molecules faib tusyees thoob plaws hauv cov tshuaj los yog ntawm ob sab ntawm daim nyias nyias. Yog li ntawd, cov txheej txheem no nres thaum lub equilibrium mus txog. Txij li qhov yooj yim diffusion tsis tshwm sim los ntawm transmembrane proteins, nws tshwm sim ntawm phospholipid bilayer. Tsis tas li ntawd, qhov yooj yim diffusion tuaj yeem thauj cov molecules me me xwb.
Kev Sib Txuas Sib Txuas yog dab tsi?
Facilitated diffusion yog ib hom kev nthuav dav uas pab txhawb kev txav ntawm cov molecules los ntawm thaj chaw siab dua mus rau thaj tsam ntawm qhov qis dua ntawm cov proteins transmembrane. Txij li thaum nws kuj tshwm sim raws cov concentration gradient, nws yog ib tug passive txheej txheem zoo li yooj yim diffusion. Tab sis, yooj yim diffusion tshwm sim los ntawm cov proteins. Li no, nws txawv ntawm qhov yooj yim diffusion.
Daim duab 02: Kev Sib Txuas Sib Txuas
Ntxiv mus, cov txheej txheem no txhawb nqa cov as-ham thoob plaws lub cell membrane yam tsis tas siv lub zog. Nws siv cov proteins los yog cov khoom thauj cov protein ntawm daim nyias nyias. Tsis tsuas yog me me molecules, tab sis yooj yim diffusion kuj pab txhawb kev txav ntawm cov molecules loj dua nyob rau hauv daim nyias nyias thiab. Zoo ib yam li qhov yooj yim diffusion, yooj yim diffusion tshwm sim txog thaum lub concentration yog sib npaug ntawm ob sab.
Dab tsi yog qhov zoo sib xws ntawm Yooj Yim Diffusion thiab Facilitated Diffusion?
- Yooj yim diffusion thiab yooj yim diffusion yog cov txheej txheem passive uas tsis siv zog.
- Ob txheej txheem tshwm sim raws li qhov concentration gradient.
- Kuj, thaum sib npaug mus txog, cov kev txav molecular nres nyob rau hauv ob txoj kev.
- Tsis tas li ntawd, cov txheej txheem no tshwm sim hauv cov hlwb thoob plaws daim nyias nyias.
Dab tsi yog qhov sib txawv ntawm Kev Yooj Yim Yooj Yim thiab Yooj Yim Diffusion?
Yooj yim diffusion tshwm sim los ntawm qhov siab dua mus rau qis dua qis dua. Transmembrane proteins tsis koom nrog qhov yooj yim diffusion. Ntawm qhov tod tes, yooj yim diffusion kuj tshwm sim los ntawm ntau dua concentration mus rau qis concentration passively. Tab sis transmembrane proteins pab kom yooj yim diffusion. Yog li, qhov no yog qhov sib txawv ntawm qhov yooj yim diffusion thiab yooj yim diffusion. Tsis tas li ntawd, qhov yooj yim diffusion tshwm sim thoob plaws hauv phospholipid bilayer thaum qhov yooj yim diffusion tshwm sim tsuas yog hla lub membrane proteins. Xws li, qhov no kuj yog qhov sib txawv ntawm qhov yooj yim diffusion thiab yooj yim diffusion.
Ib qhov sib txawv ntawm qhov yooj yim diffusion thiab yooj yim diffusion yog tias qhov yooj yim diffusion tuaj yeem thauj cov khoom me me xwb thaum qhov yooj yim diffusion tuaj yeem thauj tau ob qho tib si me thiab loj dua molecules hla lub cell membrane.
Cov hauv qab no qhia txog qhov sib txawv ntawm qhov yooj yim diffusion thiab yooj yim diffusion.
Summary – Simple Diffusion vs Facilitated Diffusion
Yooj yim diffusion thiab yooj yim diffusion yog ob txheej txheem passive uas tso cai rau cov molecules faib los ntawm ntau dua concentration mus rau qis concentration. Cov proteins transmembrane tsis txhawb nqa yooj yim diffusion. Ntawm qhov tod tes, cov cab kuj lossis cov channel cov protein pab kom yooj yim diffusion. Yog li, nws yog qhov sib txawv ntawm qhov yooj yim diffusion thiab yooj yim diffusion. Tsis tas li ntawd, thaum xav txog cov cell membrane, yooj yim diffusion tshwm sim los ntawm phospholipid bilayer ntawm lub cell membrane thaum yooj yim diffusion tshwm sim los ntawm transmembrane proteins. Yog li, qhov no yog lwm qhov sib txawv ntawm qhov yooj yim diffusion thiab yooj yim diffusion. Yooj yim diffusion tso cai rau me me molecules mus hla lub membrane thaum uas yooj yim diffusion tso cai rau ob qho tib si me me thiab loj molecule hla los ntawm daim nyias nyias. Yog li, tsab xov xwm no qhia txog qhov sib txawv ntawm qhov yooj yim diffusion thiab yooj yim diffusion.
