Kev Thauj Mus Los vsDiffusion
Kev thauj mus los thiab kev sib kis yog ob hom kev thauj mus los ntawm cov molecule thiab ion hla cov cell membranes. Kev thauj mus los tuaj yeem ua haujlwm lossis tsis ua haujlwm nyob ntawm daim ntawv lub zog uas xav tau rau kev thauj khoom. Dej, oxygen, thiab carbon dioxides dhau mus hla daim nyias nyias, thaum cov piam thaj thiab ions zoo li Na +, Ca2 + thiab K + nquag txav mus los ntawm daim nyias nyias. Kev thauj cov khoom hla ntawm cov cell membrane yog qhov tseem ceeb heev los txhawb nqa lub neej ntawm tes. Kev thauj mus los ntawm ions thiab molecules hla daim nyias nyias yog nyob ntawm qhov permeability ntawm daim nyias nyias, hom solute, thiab kev thauj mus los.
Kev thauj mus los yog dab tsi?
Kev thauj cov khoom hla ntawm cov cell membrane tiv thaiv qhov concentration gradient; uas yog los ntawm sab nrog qis concentration mus rau sab nrog ntau dua concentration, yog hu ua active thauj. Lub zog xav tau rau kev thauj mus los tau ua tiav ncaj qha lossis tsis ncaj qha los ntawm ATP hydrolysis. Ob hom kev thauj khoom nquag yog thawj kev thauj mus los thiab kev thauj mus los thib ob. Carrier proteins ntawm thawj active thauj muaj peev xwm hydrolysis ATP thiaj li hwj chim rau thauj ncaj qha. Ions zoo li Na +, Ca2 +, thiab K + yog thauj los ntawm cov txheej txheem no. Hauv kev thauj mus los theem nrab, cov concentration gradients tsim los ntawm cov twj ion yog siv los ua lub zog thauj khoom xws li qabzib, chloride, thiab bicarbonate ions thoob plaws hauv daim nyias nyias.
Diffusion yog dab tsi?
Diffusion cuam tshuam nrog kev txav ntawm cov khoom hla ntawm daim nyias nyias nrog kev pab los ntawm kev ua kom muaj zog gradient; uas yog los ntawm ntau dua concentration mus rau qis concentration. Dej thiab gases nrog rau cov pa oxygen thiab carbon dioxides yog cov khoom tseem ceeb uas txav los ntawm kev nthuav dav. Ob hom diffusion yog yooj yim diffusion thiab yooj yim diffusion. Qhov sib txawv tseem ceeb ntawm ob hom no yog qhov yooj yim diffusion suav nrog cov cab kuj protein molecules. Carrier protein molecules tsim cov cab kuj complex nrog cov khoom thauj. Vim lub siab dua solubility ntawm cov cab kuj complex nyob rau hauv lub lipid bilayer ntawm daim nyias nyias, tus nqi ntawm kev yooj yim diffusion yog ntau dua li qhov yooj yim diffusion.
Dab tsi yog qhov txawv ntawm Kev Thauj Mus Los thiab Diffusion?
• Nyob rau hauv kev thauj mus los, cov tshuaj txav tawm tsam qhov concentration gradient; Yog li, ATP lub zog yuav tsum muaj rau kev thauj mus los, tab sis hauv kev nthuav dav, cov khoom txav mus dhau los ntawm kev sib xyaw ua ke thiab nws tsis koom nrog ATP lub zog.
• Ob hom diffusion yog yooj yim diffusion thiab yooj yim diffusion, whereas ob hom active thauj yog thawj thiab thib ob active thauj.
• Hauv kev nthuav dav, ob qho tib si lipids thiab cov proteins koom nrog ua cov khoom siv hauv lub cev rau kev thauj mus los whereas, hauv kev thauj mus los, cov khoom siv hauv daim nyias nyias tsuas yog cov proteins xwb.
• Hauv qhov yooj yim diffusion, cov khoom thauj tsis khi rau cov cell membrane cov khoom whereas, nyob rau hauv active diffusion, lawv khi.
• Lub zog ntawm qhov sib txawv yog qhov concentration gradient thaum qhov kev thauj mus los yog qhov concentration gradient lossis ATP hydrolysis.
• kev thauj mus los yog qhov tshwj xeeb, qhov kev nthuav dav tsis yog tshwj xeeb.
• Nyob rau hauv kev thauj mus los, saturation tshwm sim nyob rau hauv high concentrations ntawm thauj molecules whereas, nyob rau hauv yooj yim diffusion, saturation tsis tshwm sim.
