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Video: Cov hlab ntsha puas constrict thiab dilate?
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2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Cov leeg nthuav dav thiab nruj los hloov cov ntshav li cas lawv ua tau tuav (muaj peev xwm). Thaum twg cov hlab ntsha , lawv lub peev xwm tuav cov ntshav tau txo qis, tso cai rau cov ntshav rov qab los rau hauv lub plawv los ntawm qhov uas nws tau tso rau hauv lub hlis thib peb. Vim li ntawd, ntshav siab nce. Vim li ntawd, ntshav ntshav qis.
Tsuas yog li ntawd, dab tsi ua rau cov hlab ntshav nruj?
Vasoconstriction yog qhov nqaim ntawm cov ntshav tshwm sim los ntawm contraction ntawm cov leeg nqaij ntawm cov hlab ntsha, tshwj xeeb tshaj yog cov hlab ntsha loj thiab me me arterioles. cov hlab ntshav nruj , cov ntshav ntws tau txwv lossis txo qis, yog li khaws lub cev kub lossis nce vascular kuj.
Kuj Paub, ua li cas rau cov ntshav khiav thaum lub sij hawm vasoconstriction? Vasoconstriction thiab ntshav siab Vasoconstriction txo qhov ntim los yog spaceinside cuam tshuam cov hlab ntsha . Thaum twg ntshav lub nkoj ntim tau qis dua, ntshav ntws kuj txo. Nyob rau tib lub sij hawm, qhov tsis kam los yog quab yuam ntawm ntshav ntws yog tsa. Qhov no ua rau siab dua ntshav siab.
Ua kom pom qhov no, puas caffeine dilate lossis constrict cov hlab ntsha?
Qhov laj thawj rau qhov no yog ib qho ntawm cov tshuaj pharmacological cuam tshuam ntawm caffeine yog a txwv ntawm cov hlab ntsha hauv lub hlwb. Thaum twg caffeine tsis noj qhov tshwm sim yog qhov ntawd cov hlab ntsha nthuav dav ntau dhau, uas ua rau mob taub hau.
Dab tsi ua rau vasodilation thiab vasoconstriction?
Thaum vasodilation yog qhov dav ntawm koj cov hlab ntsha, vasoconstriction yog qhov nqaim ntawm cov hlab ntsha. Nws yog los ntawm kev sib zog ntawm cov leeg hauv cov hlab ntshav. Thaum twg vasoconstriction tshwm sim, cov ntshav ntws mus rau qee qhov ntawm koj tus kheej cov ntaub so ntswg tau txwv. Koj cov ntshav siab alsorises.
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Txawm hais tias txoj hlab ntsha yog ib txwm ntseeg tias taug kev hauv qhov zawj ntawm qhov tsis zoo ntawm tus tav nrog rau cov hlab ntsha thiab cov leeg leeg, cov hlab ntsha kuj tseem tuaj yeem nyob nruab nrab ntawm cov tav. Cov paj hlwb intercostal nyob tob rau hauv cov leeg nqaij intercostal thiab sab nraud rau lub pleura
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Cov leeg yuav tsum tau li qub kom cov ntshav ntws mus rau lub plawv. Theses li qub yog qhov tshwj xeeb hauv ob txhais ceg thiab caj npab. Lawv tawm tsam lub ntiajteb txawj nqus los tiv thaiv cov ntshav rov qab los. Cov hlab ntsha tsis xav tau li qub vim tias lub siab los ntawm lub plawv ua kom cov ntshav ntws los ntawm lawv mus rau ib qho