Video: Dab tsi yog anisotropic thiab isotropic bands hauv cov leeg?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Hauv physiology, isotropic bands (zoo dua lub npe hu ua I bands ) yog cov lighter bands ntawm skeletal cov leeg cell (a.k.a. cov leeg fibers). Isotropic bands tsuas muaj actin-muaj nyias filaments. Qhov tsaus ntuj bands hu ua anisotropic bands (A bands ).
Tsis tas li ntawd, vim li cas ib pawg yog anisotropic?
Isotropy ntawm sarcomere bands hauv skeletal leeg hlwb. qhov A- Band nyob rau hauv skeletal nqaij fibers yog li lub npe vim nws yog anisotropic nyob rau hauv nws refractive index uas yog ib tug yam ntxwv ntawm orderly crystalline qauv. Ob leeg yog filamentous (raws li tsis yog globular) nyob rau hauv lub sarcomere (Actin yog tam sim no raws li F-Actin).
Tom qab, lo lus nug yog, dab tsi yog qhov kuv band hauv cov leeg? Hauv nruab nrab ntawm A bands yog ib thaj chaw lub teeb uas tsis muaj myofilaments tuab, tsuas yog nyias actin filaments. Cov no hu ua I Bands . Qhov tsaus ntuj bands yog cov strions pom nrog lub teeb microscope. Thaum a cov leeg cog lus lub teeb I bands ploj lawm thiab tsaus ntuj A bands txav ze ua ke.
Kuj Paub, koj txhais li cas los ntawm isotropic thiab anisotropic?
Isotropic yog hais txog cov khoom ntawm cov khoom uas yog ywj siab ntawm cov kev taw qhia whereas anisotropic yog kev taw qhia-nyob. Ob nqe lus no yog siv los piav qhia cov khoom ntawm cov khoom siv hauv crystallography. Qee qhov piv txwv ntawm isotropic cov ntaub ntawv yog cubic symmetry crystals, iav, thiab lwm yam.
Yuav ua li cas thaum cov leeg nqaij sib cog lus?
Thaum lub sij hawm concentric contraction, a cov leeg yog stimulated cog lus raws li txoj kev xav ntawm zawv zawg filament. Qhov no tshwm sim thoob plaws qhov ntev ntawm lub cov leeg , tsim ib tug quab yuam ntawm lub hauv paus chiv keeb thiab insertion, ua rau lub cov leeg kom luv thiab hloov lub kaum sab xis ntawm qhov sib koom ua ke.
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