Video: Yuav ua li cas molecules txav hla ib tug xaiv permeable membrane?
2024 Tus sau: Stanley Ellington | [email protected]. Kawg hloov kho: 2023-12-16 00:17
Lub cell daim nyias nyias yog xaiv permeable , tso cai rau qee yam tshuaj hla dhau . Passive thauj yog ib txoj kev me me molecules los yog ions txav hla lub cell daim nyias nyias tsis muaj kev nkag mus ntawm lub zog los ntawm lub cell. Peb yam tseem ceeb ntawm kev thauj mus los passive yog diffusion, osmosis, thiab yooj yim diffusion.
Tsuas yog li ntawd, yuav ua li cas molecules txav hla ib lub semipermeable membrane?
Semipermeable daim nyias nyias , kuj termed selectively permeable daim nyias nyias los yog ib nrab permeable daim nyias nyias , tso cai molecules los yog ions rau dhau los ntawm diffusion. Thaum diffusion thauj khoom nyob rau hauv daim nyias nyias thiab hauv cov hlwb, osmosis thauj tsuas yog dej xwb hla ib daim nyias nyias.
Ib yam li ntawd, dab tsi molecules txav hauv osmosis? Osmosis yog qhov nthuav tawm ntawm dej molecules hla ib daim nyias nyias los ntawm ib cheeb tsam ntawm cov kua concentration qis (piv txwv li, siab dua concentration ntawm dej ) mus rau thaj tsam ntawm ntau dua concentration tov (piv txwv li, qis concentration ntawm dej ). Dej txav mus rau hauv thiab tawm ntawm hlwb los ntawm osmosis.
Nyob rau hauv tas li ntawd, yuav ua li cas yog lub cell membrane xaiv permeable?
Cell membranes yog xaiv permeable . Ob peb cov tshuaj lipophilic txav mus thoob plaws cell membrane los ntawm passive diffusion. Feem ntau cov molecules me me los yog ions xav tau kev pab ntawm cov neeg nqa khoom tshwj xeeb los thauj lawv hla lub daim nyias nyias.
Yuav ua li cas dej txav mus los ntawm daim nyias nyias?
Dej kuj tau txav ywj siab hla lub cell daim nyias nyias ntawm tag nrho cov hlwb, los ntawm cov protein raws los yog los ntawm kev swb ntawm cov lipid tails ntawm lub daim nyias nyias nws tus kheej. Osmosis yog diffusion ntawm dej los ntawm ib tug semipermeable daim nyias nyias down nws concentration gradient.
Pom zoo:
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