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2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
Kev qeeb lossis thaiv cov ntshav ntws yog hu ua tsis kam . Hauv cov hlab ntsha, zoo li tsis kam nce , ntshav siab nce thiab ntws txo . Nyob rau hauv lub venous system, constriction nce ntshav siab zoo li nws ua hauv cov hlab ntsha; qhov nce siab pab kom ntshav rov qab los rau lub plawv.
Tsuas yog li ntawd, vim li cas thiaj li txo qis hauv capillaries?
Lub constriction ntawm arterioles tsub kom tsis kam uas ua rau a txo hauv cov ntshav ntws mus rau nqes hav cov hlab ntsha thiab loj dua txo hauv cov ntshav siab . Dilation ntawm cov hlab ntsha ua rau a txo nyob rau hauv tsis kam uas tsub kom ntshav ntws mus rau downstream cov hlab ntsha thiab me dua txo hauv cov ntshav siab.
Ib yam li ntawd, yuav ua li cas tshwm sim thaum lub siab txo qis? Vasodilation tshwm sim los ntawm kev so ntawm cov leeg nqaij hauv cov hlab ntsha ua rau muaj kev nce ntxiv ntshav ntws. Thaum twg ntshav cov hlab ntsha dilate, cov ntshav ntws tau nce vim yog a txo hauv vascular tsis kam. Yog li ntawd, dilation cov hlab ntsha thiab arterioles ua rau tam sim ntawd txo hauv ntshav siab thiab lub plawv dhia.
Tsuas yog li ntawd, puas siab thiab tsis sib thooj cuam tshuam?
Siab thiab ntshav ntws. Nws yog qhov tseeb uas siab dua siab exerted los ntawm lub plawv, cov ntshav sai yuav ntws. Yog li, peb muaj ib qho thim rov qab kev sib raug zoo ntawm cov hlab ntsha tsis kam thiab cov ntshav ntws - ntau dua tsis kam , qhov qeeb tus nqi ntws.
Dab tsi ua rau muaj zog peripheral tsis kam?
Peripheral kuj tau txiav txim siab los ntawm peb yam: Kev ua haujlwm tsis muaj kev sib haum xeeb: kev ua siab zoo muaj kev txwv peripheral cov hlab ntsha. Pharmacologic agents: vasoconstrictor tshuaj nce tsis kam thaum cov tshuaj vasodilator txo nws. Ntshav viscosity: nce viscosity nce kev tiv thaiv.
Pom zoo:
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