Video: Dab tsi yog cov yam ntxwv ntawm lub cell membrane?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov cell membrane ncig lub cytoplasm ntawm kev nyob hlwb , lub cev sib cais cov khoom hauv lub cev los ntawm ib puag ncig extracellular. Cov cell membrane yog semi-permeable, piv txwv li, nws tso cai rau qee yam khoom hla nws thiab tsis pub lwm tus. Cov cell membrane muaj cov ntsiab lus loj ntawm cov protein, typica
Ua raws li qhov xav tau, 3 yam ntxwv ntawm lub cell membrane yog dab tsi?
Tshuaj lom neeg daim nyias nyias muaj peb Lub luag haujlwm tseem ceeb: (1) lawv khaws cov tshuaj lom neeg tawm ntawm qhov cell ; (2) lawv muaj cov receptors thiab cov channel uas tso cai rau cov molecules tshwj xeeb, xws li ions, as-ham, pov tseg, thiab cov khoom lag luam metabolic, uas cuam tshuam cov cellular thiab extracellular kev ua ub no kom dhau ntawm organelles thiab nruab nrab ntawm cov khoom.
Qhov thib ob, dab tsi yog tus yam ntxwv ntawm cell membranes dynamic? Cell membranes yog dynamic , kua dej, thiab feem ntau ntawm lawv cov molecules muaj peev xwm txav mus rau hauv lub dav hlau ntawm lub daim nyias nyias . Cov lipid molecules tau npaj ua ob txheej txuas ntxiv mus txog 5 nm tuab (Daim duab 10-1).
Hais txog qhov no, cov yam ntxwv ntawm cov cell membrane txiav txim siab dab tsi nkag mus rau hauv lub cell thiab dab tsi tsis yog?
Cov cov yam ntxwv ntawm cov cell membrane uas txiav txim siab dab tsi nkag rau hauv ib cell thiab dab tsi tsis yog cov khoom ntawm phospholipid bilayer thiab nws cov proteins. Dab tsi txiav txim permeability ntawm a cell yog cov khoom ntawm bilayer thiab ua nyob rau hauv cov proteins.
Lub cell membranes ua haujlwm li cas?
Qhov tseem ceeb muaj nuj nqi 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:
Dab tsi yog tus yam ntxwv ntawm lub cell membrane?
Lub cell membrane yog semi-permeable, piv txwv li, nws tso cai rau qee yam khoom los ntawm nws thiab tsis pub lwm tus. Nws yog nyias, yoog raws thiab muaj sia nyob, uas muaj cov lipid bilayer nrog cov proteins embedded / Cov cell membrane muaj cov ntsiab lus loj ntawm cov protein, feem ntau nyob ib ncig ntawm 50% ntawm daim nyias nyias
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