Video: Dab tsi yog tuab filament?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Kev Txhais Lus Kho Mob ntawm tuab filament
: ib myofilament ntawm ib qho ntawm ob hom ua myofibrils uas yog 10 txog 12 nanometers (100 txog 120 angstroms) nyob rau hauv dav thiab yog tsim los ntawm cov protein myosin - piv nyias filament.
Ua li no, txoj haujlwm ntawm cov tuab tuab yog dab tsi?
Tuab filaments nyob nruab nrab ntawm sarcomeres qhov uas lawv ib nrab sib tshooj nrog nyias filaments . Qhov zawv zawg ntawm tuab filaments yav dhau los nyias filaments yog txheej txheem kev tswj hwm zoo uas tshwm sim hauv ATP-kev ua kom tsav cov leeg sib zog.
Tsis tas li ntawd, dystrophin puas yog tuab lossis nyias nyias? Dystrophin yog cov protein nyob nruab nrab ntawm sarcolemma thiab txheej sab nrauv ntawm myofilaments hauv cov leeg nqaij (myofiber). Kev txav ntawm nyias filaments (actin) tsim kev rub lub zog ntawm cov nqaij txuas txuas ntxiv uas thaum kawg dhau los ua cov leeg nqaij.
Tsuas yog li ntawd, dab tsi yog tuab thiab nyias filaments?
Tuab filaments feem ntau ntawm cov protein myosin. Txhua tus tuab filament yog kwv yees li 15 nm txoj kab nruab nrab, thiab txhua qhov yog ua los ntawm ntau pua puas molecules ntawm myosin. Nyias filaments , 7 nm txoj kab uas hla, suav nrog feem ntau ntawm cov protein actin, tshwj xeeb yog fibrous (F) actin.
Cov tuab tuab nyob qhov twg?
Cov tuab filament yog nyob ntawm qhov chaw nruab nrab ntawm sarcomere raws li cov protein loj loj txuas txuas/titin nthuav tawm ib nrab sarcomere raws tuab filaments , txuas Z-band thiab M-lines (Labeit & Kolmerer, 1995; Maruyama, 1976; Wang, McClure, & Tu, 1979).
Pom zoo:
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Dab tsi yog qhov tuab filament ntawm sarcomere?
Sarcomeres tau tsim los ntawm cov protein, cov fibrous ntev uas yog cov kab sib txuas uas swb dhau ib leeg thaum cov leeg sib cog lus lossis so. Ob ntawm cov protein tseem ceeb yog myosin, uas ua rau cov tuab filament, thiab actin, uas ua rau cov filament nyias. Myosin muaj lub ntsej muag ntev, fibrous thiab lub taub hau thoob plaws, uas khi rau actin