Dab tsi yog qhov txawv ntawm Contractile Myocardium thiab Autorhythmic Myocardium

Cov txheej txheem:

Dab tsi yog qhov txawv ntawm Contractile Myocardium thiab Autorhythmic Myocardium
Dab tsi yog qhov txawv ntawm Contractile Myocardium thiab Autorhythmic Myocardium

Video: Dab tsi yog qhov txawv ntawm Contractile Myocardium thiab Autorhythmic Myocardium

Video: Dab tsi yog qhov txawv ntawm Contractile Myocardium thiab Autorhythmic Myocardium
Video: Qhov Sib Txawv Ntawm Allergy, Flu & Coronavirus Yog Dab Tsi 2024, Hlis ntuj nqeg
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Qhov sib txawv tseem ceeb ntawm contractile myocardium thiab autorhythmic myocardium yog tias contractile myocardium yog ib hom mob plawv uas ua rau lub luag haujlwm rau kev cog lus txhawm rau txhawm rau tso ntshav thoob plaws hauv lub cev, thaum autorhythmic myocardium yog hom mob plawv uas ua haujlwm. raws li ib tug pacemaker los pib lub plawv voj voog thiab muab ib tug conduction system los tswj lub contraction ntawm cov leeg hlwb thoob plaws hauv lub plawv.

Muaj ob hom mob plawv cov leeg hlwb: contractile myocardium thiab autorhythmic myocardium. Contractile myocardium yog ib feem ntawm cov hlwb (99%) nyob rau hauv lub atria thiab ventricles. Cov hlwb no tau ua haujlwm ntawm kev cog lus. Ntawm qhov tod tes, autorhythmic myocardium suav nrog 1% ntawm lub plawv hlwb, thiab lawv tsim cov txheej txheem ntawm lub plawv.

Daim Ntawv Cog Lus Myocardium yog dab tsi?

Contractile myocardium yog ib hom kab mob plawv uas ua rau lub luag haujlwm rau kev sib cog lus txhawm rau txhawm rau tso ntshav thoob plaws hauv lub cev. Contractile myocardium yog ib feem ntawm cov hlwb (99%) nyob rau hauv lub atria thiab ventricles. Myocardial contractility sawv cev rau lub peev xwm ntawm lub plawv cov leeg (contractile myocardium) kom cog lus. Lub peev xwm los tsim cov kev hloov hauv kev quab yuam thaum lub sij hawm contraction ib txwm ua rau muaj kev sib txuas ntxiv ntawm cov ntaub so ntswg sib txawv, xws li filaments ntawm myosin (tuab) thiab actin (thin) cov ntaub so ntswg.

Ntxiv mus, qib ntawm kev khi yog nyob ntawm qhov concentration ntawm calcium ions nyob rau hauv contractile myocardium ntawm contractile hlwb. Tsis tas li ntawd, nyob rau hauv lub siab nyob rau hauv vivo, qhov kev txiav txim ntawm lub sympathetic paj hlwb yog tsav los ntawm precisely sij hawm tso tawm ntawm catecholamine. Qhov no yog txheej txheem uas txiav txim siab cov calcium ions nyob rau hauv cytosol ntawm contractile cardiac leeg hlwb. Yog li ntawd, cov yam uas ua rau muaj kev nce hauv contractility hauv lub plawv ua haujlwm los ntawm kev ua kom muaj calcium ions intracellular thaum lub sij hawm contraction. Raws li ib tug qauv uas twb muaj lawm, tsib yam ntawm contractile myocardium kev ua tau zoo yog suav tias yog lub plawv dhia, conduction tshaj tawm, preload, afterload, contractility.

Autorhythmic Myocardium yog dab tsi?

Autorhythmic myocardium yog ib hom mob plawv uas ua haujlwm ua pacemaker los pib lub voj voog plawv thiab muab cov txheej txheem coj los tswj kev sib cog lus ntawm cov leeg nqaij thoob plaws hauv lub plawv. Autorhythmic myocardium suav nrog 1% ntawm lub plawv hlwb, thiab lawv tsim cov txheej txheem ntawm lub plawv. Ntxiv mus, tshwj tsis yog rau Purkinje hlwb, lawv feem ntau me dua li cov hlwb contractile thiab tsuas muaj ob peb ntawm myofibrils lossis filaments xav tau rau kev cog lus.

Contractile Myocardium vs Autorhythmic Myocardium hauv Daim Ntawv Tabular
Contractile Myocardium vs Autorhythmic Myocardium hauv Daim Ntawv Tabular

Daim duab 01: Kev Cuam Tshuam

Lawv txoj haujlwm zoo ib yam li cov neurons, txawm tias lawv yog cov leeg nqaij tshwj xeeb. Kev ua haujlwm muaj peev xwm lossis hluav taws xob impulses hauv lub plawv pib hauv cov leeg mob tshwj xeeb hu ua autorhythmic cells. Cov hlwb no ua rau nws tus kheej excitable thiab muaj peev xwm ua kom muaj peev xwm ua tau yam tsis muaj kev txhawb nqa sab nraud los ntawm cov paj hlwb. Cov hlwb autorhythmic yog concentrated nyob rau hauv cov cheeb tsam ntawm lub sinoatrial node, atrioventricular node, atrioventricular bundle, thiab Purkinje fibers. Cov hlwb autorhythmic pib thiab nthuav tawm cov peev txheej ua haujlwm uas mus thoob plaws lub plawv thiab ua rau muaj kev sib cog lus uas txhawb cov ntshav.

Dab tsi yog qhov zoo sib xws ntawm Kev cog lus Myocardium thiab Autorhythmic Myocardium?

  • Kev cog lus myocardium thiab autorhythmic myocardium yog ob hom kab mob plawv.
  • Ob leeg koom ua ke los txhawb nqa ntshav los ntawm lub cev.
  • Lawv txoj haujlwm tseem ceeb heev rau kev ciaj sia ntawm cov tsiaj, suav nrog tib neeg.
  • Lawv ua haujlwm tsis raug tuaj yeem ua rau muaj kab mob xws li cardiomyopathy thiab plawv nres.

Qhov txawv ntawm Daim Ntawv Cog Lus Myocardium thiab Autorhythmic Myocardium yog dab tsi?

Kuv yog ib hom kev cog lus myocardium yog ib hom kev mob plawv uas ua rau lub cev muaj peev xwm ua rau lub cev ua haujlwm hauv lub cev, thaum autorhythmic yog ib hom kev nqus cov leeg nqaij hauv lub cev thiab muab ib tug conduction system los tswj lub contraction ntawm cov leeg hlwb thoob plaws hauv lub plawv. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm contractile myocardium thiab autorhythmic myocardium. Tsis tas li ntawd, kev cog lus myocardium suav nrog ntau lub hlwb (99%) hauv lub plawv hlwb, thaum autorhythmic myocardium suav nrog 1% ntawm lub plawv hlwb.

Cov hauv qab no qhia txog qhov sib txawv ntawm kev cog lus myocardium thiab autorhythmic myocardium hauv daim ntawv teev npe rau ib sab ntawm kev sib piv.

Summary – Contractile Myocardium vs Autorhythmic Myocardium

Contractile myocardium thiab autorhythmic myocardium yog ob hom kab mob plawv uas koom ua ke rau kev tso ntshav los ntawm lub cev. Contractile myocardium ua cov impulses uas yog lub luag haujlwm rau kev cog lus txhawm rau txhawm rau tso ntshav thoob plaws lub cev. Autorhythmic myocardium yog ib hom kab mob plawv uas ua haujlwm ua pacemaker los pib lub voj voog ntawm lub plawv thiab muab cov txheej txheem coj los tswj kev sib cog lus ntawm cov leeg nqaij thoob plaws hauv lub plawv. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm contractile myocardium thiab autorhythmic myocardium.

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