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Video: Yuav ua li cas rau cov nqaij du thaum nws cog lus?
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2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Cov leeg nqaij kev sib cog lus yog tshwm sim los ntawm kev swb ntawm myosin thiab actin filaments (txoj kab hluav taws xob swb) hla ib leeg. Lub zog rau qhov no tshwm sim yog muab los ntawm hydrolysis ntawm ATP. Tsis zoo li lub plawv thiab pob txha nqaij , cov nqaij du tsis muaj cov calcium-khi protein troponin.
Tsis tas li ntawd, yam tshuaj twg yog lub luag haujlwm rau txo qis ntawm cov leeg nqaij?
Acetylcholine stimulates kev cog lus hauv ib co cov nqaij du thiab so hauv lwm yam cov nqaij du hom los ntawm kev tso tawm ntawm nitric oxide.
Tsis tas li ntawd, calcium ua rau cov leeg nqaij du? Calcium pib cov leeg nqaij sib zog los ntawm kev khi rau calmodulin thiab ua kom cov enzyme myosin teeb saw kinase. Calcium kuj tseem tuaj yeem txhim kho cov nqaij du Kev ua haujlwm contractile los ntawm kev khi ncaj qha rau myosin, qhov tseem ceeb ntawm cov ntaub ntawv tuab.
Tsis tas li ntawd paub, yuav ua li cas smooth nqaij contraction zoo ib yam li skeletal nqaij contraction?
Ob tus nqaij leeg thiab cov leeg pob txha muaj tib yam kev cog lus, piv txwv li actin thiab myosin. Hauv ob qho tib si cov leeg , cov kev cog lus yog pib los ntawm impulse, ob qho tib si xav tau calcium thiab ATP rau cov nqaij contraction.
Puas yog cov leeg nqaij leeg yuav tsum muaj peev xwm ua tau?
Txij thaum cov nqaij du hlwb ua tsis muaj hluav taws xob-gated sodium raws, peev xwm ua tsim tawm yog qhov tshwm sim ntawm cov calcium tuaj. Ib qho tseem ceeb ceeb toom: ncua ntev kev cog lus ntawm nqaij leeg yuav tsum tau extracellular calcium.
Pom zoo:
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Edema yog tshwm sim los ntawm cov kua dej ntau dhau hauv cov ntaub so ntswg. Lwm cov tsos mob edema yuav muaj xws li daim tawv nqaij uas ncab los yog ci iab; daim tawv nqaij uas nyob twj ywm tom qab raug nias tsawg kawg tsib vib nas this; thiab nce hauv plab me me. Edema tuaj yeem cuam tshuam rau lub ntsws thiab ua rau ua pa luv uas xav tau kev kho mob tam sim
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Nco ntsoov tias thaum lub cev nqaij ntshiv, qhov ntev ntawm cov kab xev tsis hloov pauv. Qhov loj ntawm A band tsis hloov pauv qhov loj me. Thaum kawg, H zone yog qhov nruab nrab ntawm cov sarcomere uas tsuas yog tuab myosin filaments. Thaum cov leeg nqaij contraction, H zone shortens
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Thaum lub plawv mob leeg nqaij sib cog lus, myosin filament rub cov actin filaments mus rau ib leeg, uas ua rau lub cell nqaim. Lub xovtooj ntawm tes siv ATP los txhawb qhov kev cog lus no. Qhov no tsim ib chav tsev ntawm cov leeg nqaij, hu ua sarcomere. Intercalated discs txuas lub plawv mob hlwb