Video: Cov plasma membrane yog dab tsi?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Cov plasma daim nyias nyias , kuj hu ua cell daim nyias nyias , yog daim nyias nyias pom nyob rau hauv tag nrho cov hlwb uas cais cov sab hauv ntawm lub cell los ntawm sab nraud ib puag ncig. Cov plasma daim nyias nyias Nws muaj cov lipid bilayer uas yog semipermeable. Cov plasma daim nyias nyias tswj kev thauj cov khoom nkag thiab tawm ntawm lub cell.
Ua raws li qhov no hauv kev xav, dab tsi yog qhov plasma membrane ntawm lub cell?
Tag nrho cov cell yog surrounded los ntawm ib tug plasma membrane. Lub membrane yog tsim los ntawm phospholipid bilayer txheej txheem rov qab-rau-rov qab. Lub daim nyias nyias kuj tau them rau hauv qhov chaw nrog cov roj cholesterol molecules thiab cov proteins . Lub plasma membrane yog xaiv permeable thiab tswj cov molecules uas tso cai rau nkag mus thiab tawm ntawm lub cell.
Ib sab saum toj no, dab tsi yog 3 lub luag haujlwm ntawm plasma membrane? Tshuaj lom neeg daim nyias nyias muaj peb thawj muaj nuj nqi : (1) lawv khaws cov tshuaj lom neeg tawm ntawm lub 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.
Yog li ntawd, plasma membrane luv teb yog dab tsi?
Plasma Membrane Txhais. Cov plasma daim nyias nyias ntawm a cell yog lub network ntawm lipids thiab cov proteins uas tsim cov ciam teb ntawm a cell cov cov ntsiab lus thiab sab nraud ntawm lub cell . Nws yog semi-permeable thiab tswj cov ntaub ntawv uas nkag mus thiab tawm ntawm lub cell . Cov hlwb ntawm txhua yam muaj sia muaj plasma daim nyias nyias.
Vim li cas nws thiaj li hu ua plasma membrane?
Cov ntshav ntshav yog "filling" ntawm lub cell , thiab tuav cov cell cov organelles. Yog li, sab nraud daim nyias nyias ntawm cell yog qee zaum hu ua cell membrane thiab qee zaum hu ua plasma membrane , vim hais tias yog dab tsi nws yog nyob rau hauv kev sib cuag nrog. Yog li ntawd, tag nrho cov hlwb yog surrounded los ntawm ib tug plasma daim nyias nyias.
Pom zoo:
Lub luag haujlwm ntawm plasma membrane proteins yog dab tsi?
Membrane cov nqaijrog yuav ua raws li enzymes rau kom tshuaj haum, ua raws li receptors rau tej molecules, los yog thauj ntaub ntawv thoob plaws hauv lub cell daim nyias nyias. Carbohydrates, los yog suab thaj, qee zaum pom txuas nrog cov proteins lossis lipids sab nraud ntawm lub cell membrane
Dab tsi yog cov tails ntawm phospholipids ntawm cov plasma membrane muaj li ntawm?
Phospholipids yog ib chav kawm ntawm lipids uas yog ib feem tseem ceeb ntawm tag nrho cov cell membranes. Lawv tuaj yeem tsim cov lipid bilayers vim lawv cov yam ntxwv amphiphilic. Cov qauv ntawm cov phospholipid molecule feem ntau muaj ob hydrophobic fatty acid 'tails' thiab ib tug hydrophilic 'lub taub hau' uas muaj ib pab pawg neeg phosphate
Cov qauv thiab kev ua haujlwm ntawm plasma membrane yog dab tsi?
Lub luag haujlwm tseem ceeb ntawm plasma membrane yog los tiv thaiv lub cell ntawm nws ib puag ncig. Ua los ntawm cov phospholipid bilayer nrog cov proteins embedded, plasma membrane yog xaiv permeable rau ions thiab organic molecules thiab tswj kev txav ntawm cov khoom hauv thiab tawm ntawm cov hlwb
Dab tsi yog qhov tseem ceeb tshaj plaws uas yuav tsum muaj rau cov kua dej ntws hauv cov kav dej Dab tsi lwm yam cuam tshuam rau cov dej ntws?
Thaum ib qho kev quab yuam sab nraud yog exerted rau ntawm cov kua uas muaj, qhov tshwm sim siab yog kis sib npaug thoob plaws hauv cov kua. Yog li txhawm rau kom dej ntws, dej xav tau qhov sib txawv siab. Cov kav dej kuj tuaj yeem cuam tshuam los ntawm cov kua dej, cov yeeb nkab loj, qhov kub thiab txias (cov kav dej khov), cov kua dej ntom ntom
Dab tsi yog cov yam ntxwv ntawm plasma membrane?
Tag nrho cov cell yog surrounded los ntawm ib tug plasma membrane. Lub membrane yog tsim los ntawm phospholipid bilayer txheej txheem rov qab-rau-rov qab. Lub daim nyias nyias kuj tau them rau hauv qhov chaw nrog cov roj cholesterol molecules thiab cov proteins. Lub plasma membrane yog xaiv permeable thiab tswj cov molecules uas tso cai rau nkag mus thiab tawm ntawm lub cell