Cov txheej txheem:
![Ntev npaum li cas lub plawv ua lub peev xwm kawg? Ntev npaum li cas lub plawv ua lub peev xwm kawg?](https://i.answers-medical.com/preview/medical-health/13875134-how-long-does-a-cardiac-action-potential-last-j.webp)
Video: Ntev npaum li cas lub plawv ua lub peev xwm kawg?
![Video: Ntev npaum li cas lub plawv ua lub peev xwm kawg? Video: Ntev npaum li cas lub plawv ua lub peev xwm kawg?](https://i.ytimg.com/vi/Q2ytaTvUF6U/hqdefault.jpg)
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
200 txog 400 ms
Hauv qhov no, vim li cas thiaj li ua rau lub plawv muaj peev xwm ntev dua?
Cov muaj peev xwm ua haujlwm plawv yog qhov tshwj xeeb hauv nws lub sijhawm ntev thaum piv nrog ion raws hauv cov leeg pob txha thiab cov leeg hlwb. Qhov tseem ceeb tshaj ntawm cov dej ntws sab hauv thaum lub sijhawm muaj peev xwm nqis tes ua toj siab yog lub hauv paus calcium tam sim no.
Ib qho ntxiv, dab tsi yog cov theem ntawm lub peev xwm ua haujlwm plawv? Sab saum toj vaj huam sib luag los ntawm atrial (sab laug) thiab ventricular (txoj cai) myocytes. Tsib theem ntawm qhov muaj peev xwm nqis tes ua (AP) tau sau tias: 0, qhov sawv ntawm AP sawv cev depolarization ntawm daim nyias nyias; 1, pib rov ua dua tshiab; 2, theem toj siab; 3, lig repolarization theem; thiab 4, theem so (diastolic).
Ib yam li ntawd, koj yuav nug, yuav ua li cas thiaj li muaj peev xwm ua haujlwm hauv plawv?
Lub plawv muaj peev xwm nqis tes ua yog qhov hloov pauv luv hauv qhov hluav taws xob (membrane peev xwm ) hla lub cell membrane ntawm plawv hlwb. Qhov no muaj peev xwm nqis tes ua hla nrog cov xovtooj ntawm tes ua rau lub cell cog lus, yog li kev ua haujlwm ntawm SAN ua rau so plawv tus nqi kwv yees li 60-100 neeg ntaus ib feeb.
Ob hom kev nqis tes ua hauv lub siab yog dab tsi?
Cov Ntsiab Lus Tseem Ceeb: Muaj ob hom kev muaj peev xwm ua hauv
- Cov peev txheej ua tau nrawm/ntev tau tsim hauv cov hlwb ua haujlwm thiab Purkinje fibers. Cov cell ua haujlwm tsis tuaj yeem tshwm sim tsis siv neeg, thiab lawv tsis muaj qhov cuam tshuam ncaj qha mus rau qhov pib rau tsim cov peev xwm ua.
- Cov peev txheej ua qeeb/luv luv tau tsim hauv SA & AV nodes.
Pom zoo:
Lub plawv plawv twg tsim lub hauv paus ntawm lub plawv?
![Lub plawv plawv twg tsim lub hauv paus ntawm lub plawv? Lub plawv plawv twg tsim lub hauv paus ntawm lub plawv?](https://i.answers-medical.com/preview/medical-health/13846400-which-heart-chamber-forms-the-base-of-the-heart-j.webp)
Lub hauv paus ntawm lub plawv (sab nraub qaum): Nws tau tsim los ntawm sab laug atrium, uas yog plaub txoj hlab ntshav hlab ntshav. Nws nyob ntawm qhov ntxeev ntawm lub apex
Lub peev xwm ua kom lub plawv dhia zoo li cas?
![Lub peev xwm ua kom lub plawv dhia zoo li cas? Lub peev xwm ua kom lub plawv dhia zoo li cas?](https://i.answers-medical.com/preview/medical-health/13868216-what-is-the-pacemaker-potential-of-the-heart-j.webp)
Hauv lub tshuab ua kom nrawm ntawm lub plawv (piv txwv li, sinoatrial node), lub tshuab ua kom muaj zog (tseem hu ua lub tshuab ua kom lub zog tam sim no) yog qhov qeeb, qhov nce zoo hauv qhov hluav taws xob hla lub xovtooj ntawm tes (lub peev xwm membrane) uas tshwm sim nruab nrab ntawm qhov kawg ntawm kev nqis tes ua. muaj peev xwm thiab pib qhov peev xwm ua tom ntej
Yuav ua li cas lub plawv ua lub peev xwm nthuav tawm hauv plawv?
![Yuav ua li cas lub plawv ua lub peev xwm nthuav tawm hauv plawv? Yuav ua li cas lub plawv ua lub peev xwm nthuav tawm hauv plawv?](https://i.answers-medical.com/preview/medical-health/13935416-how-do-cardiac-action-potentials-propagate-through-the-heart-j.webp)
SA Node tau txuas ncaj qha rau kev cog lus atrial cardiomyocytes thiab qee qhov kev coj ua uas paub zoo hu ua 'Interatrial Band' uas nthuav tawm qhov ua tau sai los ntawm sab xis mus rau sab laug atrium. Yog li, tom qab pib los ntawm SA Node, lub plawv ua haujlwm muaj peev xwm ua ntej kis mus thoob plaws ob qho tib si atria
Nws siv sijhawm ntev npaum li cas rau cawv kom cuam tshuam koj lub peev xwm tsav tsheb?
![Nws siv sijhawm ntev npaum li cas rau cawv kom cuam tshuam koj lub peev xwm tsav tsheb? Nws siv sijhawm ntev npaum li cas rau cawv kom cuam tshuam koj lub peev xwm tsav tsheb?](https://i.answers-medical.com/preview/medical-health/14108894-how-long-does-it-take-for-alcohol-to-affect-your-driving-ability-j.webp)
Nws yuav siv sijhawm kwv yees li 30 feeb mus rau ob teev rau cawv kom nqus mus rau hauv koj cov ntshav. Lub sijhawm no, koj txoj kev ua pa yuav qeeb thiab koj lub peev xwm kev paub yuav raug ncua. Vim li no, nws ib txwm txaus ntshai rau haus thiab tsav tsheb
Ntev npaum li cas tus hniav yuav kav ntev npaum li cas tom qab lub hauv paus hniav?
![Ntev npaum li cas tus hniav yuav kav ntev npaum li cas tom qab lub hauv paus hniav? Ntev npaum li cas tus hniav yuav kav ntev npaum li cas tom qab lub hauv paus hniav?](https://i.answers-medical.com/preview/medical-health/14109948-how-long-does-a-tooth-last-after-a-root-canal-j.webp)
Tom qab cov hauv paus hniav, nws tsuas tuaj yeem siv sijhawm ntxiv 10-15 xyoo. Txawm li cas los xij, muaj ntau txoj hauv kev los pab koj cov hniav kom tas mus li hauv koj lub neej. Koj tuaj yeem muaj nws crowned, uas yuav ntxiv dag zog thiab durability rau cov hniav