![Yuav ua li cas pib cov txheej txheem ntawm pob txha pob txha contraction? Yuav ua li cas pib cov txheej txheem ntawm pob txha pob txha contraction?](https://i.answers-medical.com/preview/medical-health/14137964-what-initiates-the-process-of-skeletal-muscle-contraction-j.webp)
Video: Yuav ua li cas pib cov txheej txheem ntawm pob txha pob txha contraction?
![Video: Yuav ua li cas pib cov txheej txheem ntawm pob txha pob txha contraction? Video: Yuav ua li cas pib cov txheej txheem ntawm pob txha pob txha contraction?](https://i.ytimg.com/vi/PcoHqJDBL9M/hqdefault.jpg)
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Kev tso tawm ntawm calcium ions pib nqaij contractions . Cov kev cog lus ntawm a cov leeg nqaij fiber ntau tshwm sim raws li sarcomeres, linearly teem nyob rau hauv myofibrils, luv luv li myosin taub hau rub rau ntawm actin filaments.
Tom qab ntawd, ib tus tseem tuaj yeem nug, txheej txheem ntawm cov leeg sib zog yog dab tsi?
Cov nqaij contraction Lub voj voog yog tshwm sim los ntawm calcium ions khi rau cov protein complex troponin, nthuav tawm cov chaw ua haujlwm ntawm cov actin. ATP tom qab ntawd khi rau myosin, txav cov myosin mus rau nws lub zog siab, tso lub taub hau myosin los ntawm qhov chaw ua haujlwm actin.
Tsis tas li ntawd, cov txheej txheem ntawm excitation contraction coupling yog dab tsi? Kev sib zog ua kom muaj zog yog txheej txheem los ntawm qhov kev txhawb hluav taws xob ua rau tso tawm cov calcium los ntawm sarcoplasmic reticulum, pib ua cov txheej txheem ntawm cov leeg kev cog lus los ntawm sarcomere shortening.
Raws li, qhov xwm txheej twg yuav tsum tshwm sim ua ntej ua rau cov leeg pob txha txhawm rau tsim kom muaj peev xwm ua thiab cog lus?
1. A Cov leeg nqaij Nws tshwm sim thaum muaj peev xwm ua tau raws li cov hlab ntsha mus rau cov leeg. Nqaij leeg pib thaum lub paj hlwb tsim lub teeb liab. Lub teeb liab, lub impulse hu ua lub peev xwm ua tau, mus los ntawm ib hom paj hlwb hu ua lub cev muaj zog neuron.
Cov leeg nqaij skeletal cog lus li cas?
Cov leeg lub zog txav los ntawm kev hloov pauv ntawm cov duab ntawm myosin. Lub taub hau myosin khi rau actin thiab rhuav tshem ATP. Qhov no tso tawm lub zog uas rub cov actin filaments nrog. Lub myosin taub hau qaij, uas rub cov actin thiab ua rau cov nqaij rau daim ntawv cog lus.
Pom zoo:
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Cov txheej txheem sab nraud, uas yog ua los ntawm cov organic matrix (30%) muaj cov proteoglycans (tab sis tsawg dua pob txha mos), glycosaminoglycans, glycoproteins, osteonectin (thauj cov pob txha pob txha mus rau collagen) thiab osteocalcin (calcium khi protein)
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Laser qhov muag phais los yog laser corneal phais yog ib txoj kev kho mob uas siv lub laser los kho qhov chaw ntawm lub qhov muag los kho myopia (short-sightedness), hypermetropia (ntev-sightedness), thiab astigmatism (tsis ncaj curvature ntawm lub qhov muag nto)
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Cov ntsiab lus hauv cov txheej txheem no (8) ua kom cov vascular endothelium. vasodilation. ua npaws ntau lawm. tsiv teb tsaws ntawm cov kab mob tiv thaiv kab mob hlwb mus rau thaj chaw. ua kom thiab cytokine tso tawm los ntawm neutrophils. phagocytosis thiab cov hau kev ntawm kev puas tsuaj. tus mob theem teb. clotting cascade