![Kev tiv thaiv cuam tshuam li cas? Kev tiv thaiv cuam tshuam li cas?](https://i.answers-medical.com/preview/medical-health/14170047-how-does-resistance-affect-pressure-j.webp)
Video: Kev tiv thaiv cuam tshuam li cas?
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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, cov 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.
Tom qab ntawd, ib tus tuaj yeem nug, ua li cas siab thiab tsis kam cuam tshuam nrog?
Siab yog cov kua dej nyuaj npaum li cas peing thawb nrog lub raj lossis lub nkoj. Nws yog siv los kov yeej cov tsis kam los ntawm lub nkoj phab ntsa. Kuj yog qhov nyuaj npaum li cas lub nkoj tab tom sim nres cov dej ntws. Nws tau tsim los ntawm lub nkoj me me li cas, thiab kev sib txhuam ntawm ob sab.
Tsis tas li ntawd, peb yam tseem ceeb cuam tshuam txog ntshav siab yog dab tsi? Cov peb yam uas pab txhawb rau ntshav siab yog tsis kam, ntshav viscosity, thiab ntshav nkoj txoj kab uas hla Kev tawm tsam hauv peripheral ncig yog siv los ntsuas qhov no yam . Lub nkoj ntev dua, qhov ua haujlwm ntau dua. Ntshav viscosity qhia koj li cas koj tuab ntshav yog
Ib yam li ntawd, tib neeg nug, cov ntshav ntws cuam tshuam li cas rau lub siab thiab kev tiv thaiv?
Kev sib raug zoo ntawm ntws (Q), tsis kam (R), thiab siab qhov sib txawv (∆P) qhia los ntawm Ohm txoj cai (Q = ∆P/R). Qhov ntau ntawm ntshav ntws yog ncaj qha proportional rau cov siab sib txawv. Cov kev taw qhia ntawm ntshav ntws yog txiav txim los ntawm cov kev taw qhia ntawm lub siab gradient los ntawm siab rau qis siab.
Vim li cas cov hlab ntsha poob siab?
Feem ntau cov ntshav siab txo qis ntawm cov hlab ntsha mus rau cov leeg, thiab qhov no yog vim qhov siab overcoming qhov tsis kam ntawm cov hlab ntsha. Dilation ntawm cov hlab ntsha ua rau txo qis hauv kev tiv thaiv uas ua rau cov ntshav ntws mus rau cov hlab ntsha qis thiab txo qis hauv cov ntshav siab.
Pom zoo:
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Tiv thaiv kev tiv thaiv kev sib cais -siv rau kis kab mob, kab mob, lossis kab mob uas kis los ntawm kev kov tus neeg mob lossis khoom hauv chav (piv txwv: MRSA, VRE, mob raws plab, qhib qhov txhab, RSV). Cov neeg ua haujlwm saib xyuas kev noj qab haus huv yuav tsum: Hnav lub tsho thiab hnab looj tes thaum nyob hauv tus neeg mob chav
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Lub cev tiv thaiv kab mob yog lub network nyuaj ntawm cov cell thiab cov protein uas tiv thaiv lub cev tiv thaiv kab mob. Lub cev tiv thaiv kab mob khaws cov ntaub ntawv ntawm txhua tus kab mob (microbe) nws tau swb lawm yog li nws tuaj yeem lees paub thiab rhuav tshem cov kab mob sai sai yog tias nws nkag mus rau hauv lub cev dua
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Barrier contraceptives tiv thaiv cov phev los ntawm tus poj niam lub tsev menyuam. Lawv suav nrog cov hnab looj qau, diaphragm, lub kaus mom lub ncauj tsev menyuam, thiab daim txhuam cev tiv thaiv kab mob. Qee cov hnab yas looj muaj cov tshuaj tua kab mob. Cov tshuaj tua kab mob yuav tsum tau siv nrog cov hnab looj tes thiab lwm yam tshuaj tiv thaiv kab mob uas twb tsis muaj lawm
Dab tsi yog cov tshuaj tiv thaiv thiab lawv cuam tshuam nrog cov tshuaj tiv thaiv li cas?
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Cov tshuaj tiv thaiv kab mob (immunoglobins) yog cov protein zoo li Y tsim los ntawm B hlwb ntawm lub cev tiv thaiv kab mob hauv kev teb rau kis rau antigens. Txhua cov tshuaj tiv thaiv muaj ib qho paratope uas paub txog ib qho epitope ntawm ib qho antigen, ua zoo li lub xauv thiab qhov tseem ceeb binding mechanism
Kev tiv thaiv dab tsi tshwm sim los ntawm kev txhaj tshuaj tiv thaiv?
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Artificially tau txais kev tiv thaiv kab mob tuaj yeem tsim los ntawm tshuaj tiv thaiv, ib yam khoom uas muaj antigen. Ib qho tshuaj tiv thaiv ua rau cov lus teb thawj zaug tawm tsam antigen yam tsis ua rau cov tsos mob ntawm tus kab mob