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2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Ob qhov kev hloov pauv hauv myosin txhais tau tias tus ntoo khaub lig hla voj voog nyob rau hauv cov nqaij du yog me ntsis qeeb dua tshaj li nws yog nyob rau hauv cev pob txha cov leeg . Qhov no txhais tau tias cov nqaij du txuag qee qhov ATP hauv ib qho muab rau lub sijhawm vim tias muaj tsawg dua crossbridge lub voj voog tshwm sim nyob rau lub sijhawm ntawd.
Cov lus nug tseem yog, vim li cas cov leeg nqaij sib zog qeeb?
Cov peev xwm ua hauv cov nqaij du cell yog qeeb dua tshaj li qhov muaj peev xwm ua rau pob txha, thiab lawv tuaj yeem kav yuav luag tsib caug lub sijhawm ntev. Qhov no tau xav tias yuav tshwm sim vim tias cov calcium hauv cov nqaij du hlwb qhib qeeb dua tshaj li lub cev cov leeg.
Qhov thib ob, puas ua rau cov leeg sib zog ua kom muaj peev xwm nqis tes ua? Txij li 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.
Tib neeg kuj nug, ua li cas cov txheej txheem ntawm cov leeg nqaij sib txawv ntawm kev cog lus hauv cov leeg pob txha?
Txawm hais tias cov leeg nqaij sib zog vam khom lub xub ntiag ntawm Ca++ ions, cov nqaij du cov fibers muaj cov kab uas hla me dua li cov leeg nqaij hlwb. Nqaij leeg txuas ntxiv mus txog thaum ATP-nyob ntawm cov twj calcium uas nquag thauj Ca++ ions rov qab rau hauv SR thiab tawm ntawm tes.
Puas yog cov leeg nqaij muaj peev xwm tswj hwm lub xeev cog lus rau lub sijhawm ntev dua?
Tus Qauv thiab Kev Ua Haujlwm. Cov leeg nqaij txawv ntawm pob txha cov leeg hauv kev ua haujlwm. Tsis zoo li pob txha cov leeg , cov nqaij du muaj peev xwm ntawm kev tswj xyuas tone rau ncua sij hawm thiab feem ntau cog lus tsis tas yuav. Hauv qib cellular, cov nqaij du tuaj yeem piav qhia raws li qhov tsis tuaj yeem ua, tsis muaj kev cuam tshuam cov leeg.
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