Nyob rau hauv cov leeg nqaij contraction, lub myosin taub hau rub cov actin filaments mus rau ib leeg ua rau ib tug luv luv sarcomere sarcomere A sarcomere yog ib chav tsev contractile ntawm cov nqaij fibers, thiab muaj ob ib nrab. - filaments ntawm actin thiab tag nrho filament ntawm myosin. Qhov kawg ntawm sarcomere yog Z-discs thiab qhov chaw yog qhov chaw nruab nrab yog M-kab (qhov nruab nrab ntawm myosin filament). https://www.varsitytutors.com › sarcomeres
Sarcomeres - MCAT Biology - Varsity Tutors
. Thaum I band thiab H zone yuav ploj lossis luv, qhov ntev A band yuav tsis hloov pauv.
Dab tsi ploj thaum cov leeg mob cog lus?
Thaum cov leeg cog lus teeb kuv bands plojthiab qhov tsaus ntuj A band txav los ze zog ua ke. Qhov no yog vim qhov swb ntawm myofilaments tawm tsam ib leeg. Z-kab rub ua ke thiab sarcomere luv li saum toj no.
Cov leeg nqaij hlav nyob qhov twg?
Cov leeg nqaij pib thaum lub paj hlwb tsim cov teeb liab. Lub teeb liab, ib qho impulse hu ua lub peev xwm ua tau, mus los ntawm ib hom paj hlwb hu ua lub cev muaj zog neuron. Lub neuromuscular hlws ris yog lub npe ntawm qhov chaw uas lub cev muaj zog neuron mus txog ib leeg leeg.
Yuav ua li cas thaum lub cev nqaij daim tawv?
Cov leeg nqaij hlav tshwm sim thaum sarcomeres luv, raws li tuab thiab nyias filaments swbyav dhau los ib leeg, uas yog hu ua zawv zawg filament qauv ntawm cov leeg nqaij. ATP muab lub zog rau kev tsim hla choj thiab filament zawv zawg.
Yuav ua li cas yog cov kauj ruam tseem ceeb hauv cov leeg nqaij?
Cov txheej txheem ntawm cov leeg nqaij contraction tshwm sim dhau ntau cov kauj ruam tseem ceeb, suav nrog:
- Depolarisation thiab calcium ion tso tawm.
- Actin thiab myosin cross-bridge tsim.
- Sliding mechanism ntawm actin thiab myosin filaments.
- Sarcomere shortening (muscle contraction)
