![Dab tsi ua rau muaj qhov nce hauv contractility ntawm lub plawv thaum ua si? Dab tsi ua rau muaj qhov nce hauv contractility ntawm lub plawv thaum ua si?](https://i.answers-medical.com/preview/medical-health/14133139-what-causes-an-increase-in-contractility-of-the-heart-during-exercise-j.webp)
Video: Dab tsi ua rau muaj qhov nce hauv contractility ntawm lub plawv thaum ua si?
![Video: Dab tsi ua rau muaj qhov nce hauv contractility ntawm lub plawv thaum ua si? Video: Dab tsi ua rau muaj qhov nce hauv contractility ntawm lub plawv thaum ua si?](https://i.ytimg.com/vi/-Wi0cOa6OkM/hqdefault.jpg)
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Kev tawm dag zog nce ntxiv kev ua siab zoo thiab txo cov kev ua ntawm parasympathetic, ua rau nce contractility thiab nce stroke ntim. Cov nce stroke ntim thiab lub plawv dhia ua rau muaj kev nce ntxiv hauv mob plawv tso tawm, uas yog qhov tsim nyog kom xa cov pa oxygen ntau ntxiv rau kev tawm dag zog cov leeg nqaij.
Tib neeg tseem nug, dab tsi ua rau muaj kev cog lus ntau ntxiv?
Ib nce nyob rau hauv sympathetic stimulation rau lub plawv nce contractility thiab lub plawv dhia. Ib nce nyob rau hauv afterload yuav nce kev cog lus (los ntawm cov nyhuv Anrep). Ib nce nyob rau hauv lub plawv dhia yuav nce kev cog lus (los ntawm Bowditch effect).
Tsis tas li ntawd, contractility ntawm lub plawv txhais li cas? Kev cog lus yog lub hauv paus muaj zog thiab muaj zog ntawm lub lub plawv contraction thaum lub sij hawm systole. Raws li Starling Txoj Cai, lub plawv yuav tshem tawm qhov mob stroke ntau dua ntawm kev sau ntau dua. Rau txhua qhov kev sau siab (LAP), qhov mob stroke yuav ntau dua yog tias kev cog lus ntawm lub plawv yog ntau dua.
Ib yam li ntawd, tib neeg nug, dab tsi ua rau muaj kev sib kis ntawm cov leeg nqaij?
Cov xwm txheej ua kom lub plawv contractility - zoo inotropic nyhuv [1]: Sympathetic paj hlwb ua kom. Tshaj tawm cov catecholamines endogenous. Cov tshuaj - cov tshuaj inotropic, digoxin, calcium ions (Ca2+)
Ua li cas lub paj hlwb sympathetic nce lub plawv contractility?
Cov sympathetic paj hlwb tso tawm norepinephrine (NE) thaum lub parasympathetic lub paj hlwb tso tawm acetylcholine (ACh). Txaus siab kev txhawb nqa nce plawv tus nqi thiab myocardial contractility.
Pom zoo:
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