Cov kab lus "ib puag ncig hauv lub cev" tau tshwm sim ua tsaug rau Fabkis tus kws kho mob hlwb Claude Bernard, uas nyob rau xyoo 19th. Hauv nws cov haujlwm, nws tau hais meej tias qhov tsim nyog rau lub neej ntawm lub cev yog kom muaj kev ruaj khov nyob rau hauv ib puag ncig sab hauv. Qhov kev muab no tau los ua lub hauv paus rau txoj kev xav ntawm homeostasis, uas tau tsim tom qab (hauv xyoo 1929) los ntawm tus kws tshawb fawb W alter Cannon.
Homeostasis yog qhov txheeb ze tsis tu ncua ntawm ib puag ncig sab hauv,
nrog rau qee qhov kev ua haujlwm zoo li qub. Sab hauv ib puag ncig ntawm lub cev yog tsim los ntawm ob lub kua - intracellular thiab extracellular. Qhov tseeb yog tias txhua lub xov tooj ntawm lub cev muaj sia ua haujlwm tshwj xeeb, yog li nws xav tau cov khoom noj tas li ntawm cov as-ham thiab oxygen. Nws kuj xav tias yuav tsum tau tshem tawm tas li ntawm cov khoom metabolic. Cov khoom tsim nyog tuaj yeem nkag mus rau hauv daim nyias nyias tsuas yog yajxeev, uas yog vim li cas txhua lub cell yog ntxuav los ntawm cov ntaub so ntswg kua, uas muaj txhua yam tsim nyog rau nws cov hauj lwm tseem ceeb. Nws yog nyob rau hauv lub npe hu ua extracellular kua thiab tso nyiaj rau 20 feem pua ntawm lub cev qhov hnyav.
Qhov chaw sab hauv ntawm lub cev, muaj cov kua dej ntxiv, muaj:
- lymph (ib feem tseem ceeb ntawm cov ntaub so ntswg kua) - 2 l;
- ntshav - 3 l;
- interstitial fluid - 10 l;
- transcellular kua - txog 1 liter (nws suav nrog tus txha caj qaum, pleural, synovial, intraocular kua).
Lawv txhua tus muaj qhov sib txawv thiab sib txawv ntawm lawv txoj haujlwm
khoom. Tsis tas li ntawd, ib puag ncig sab hauv ntawm tib neeg lub cev tuaj yeem muaj qhov sib txawv me me ntawm kev noj cov tshuaj thiab lawv cov khoom noj. Vim li no, lawv cov concentration fluctuates tas li. Piv txwv li, cov piam thaj hauv cov ntshav ntawm tus neeg laus tuaj yeem nyob ntawm 0.8 txog 1.2 g / l. Yog tias cov ntshav muaj ntau lossis tsawg dua ntawm qee yam khoom ntau dua li qhov tsim nyog, qhov no qhia tias muaj tus kabmob.
Raws li twb tau sau tseg lawm, ib puag ncig sab hauv ntawm lub cev muaj cov ntshav ua ib yam khoom. Nws muaj plasma, dej, proteins, rog, qabzib, urea thiab ntxhia ntsev. Nws qhov chaw tseem ceeb yog cov hlab ntsha (capillaries, veins, arteries). Ntshav yog tsim los ntawm kev nqus ntawm cov protein, carbohydrates, rog, dej. Nws lub luag haujlwm tseem ceeb yog kev sib raug zoo ntawm lub cev nrog rau qhov chaw sab nraud, xa mus raulub cev ntawm cov khoom tseem ceeb, excretion ntawm cov khoom lwj los ntawm lub cev. Nws kuj ua haujlwm tiv thaiv thiab humoral.
Cov ntaub so ntswg muaj dej thiab cov as-ham yaj hauv nws, CO 2, O2, nrog rau cov khoom sib cais. Nws nyob hauv qhov chaw ntawm cov ntaub so ntswg thiab tsim los ntawm cov ntshav plasma. Cov ntaub so ntswg yog nruab nrab ntawm cov ntshav thiab cov hlwb. Nws thauj los ntawm cov ntshav mus rau cov hlwb O2, ntxhia ntsev, as-ham.
Lymph muaj dej thiab cov organic uas yaj hauv nws. Nws yog nyob rau hauv lub lymphatic system, uas muaj lymphatic capillaries, cov hlab ntsha merged rau hauv ob ducts thiab ntws mus rau hauv lub vena cava. Nws yog tsim los ntawm cov ntaub so ntswg, nyob rau hauv cov hnab yas uas nyob rau ntawm qhov kawg ntawm lymphatic capillaries. Lub luag haujlwm tseem ceeb ntawm cov qog ntshav qab zib yog rov qab cov kua dej rau hauv cov hlab ntsha. Tsis tas li ntawd, nws lim thiab tshuaj tua kab mob cov ntaub so ntswg.
Raws li peb tau pom, ib puag ncig sab hauv ntawm lub cev yog kev sib xyaw ntawm lub cev, lub cev muaj tshuaj lom neeg, raws li, thiab cov kab mob caj ces cuam tshuam rau kev ua neej nyob.
