Qhov Tseem Ceeb Qhov txawv - Osmotic siab vs Oncotic siab
Osmotic siab thiab oncotic siab yog ob qho tseem ceeb ntawm lub cev uas pab piav qhia txog kev txav ntawm cov kuab tshuaj thiab cov kuab tshuaj molecules rau hauv thiab tawm ntawm cov ntshav capillary, txawm hais tias muaj qhov sib txawv ntawm ob nqe lus no. Lawv yog ib qho tseem ceeb rau kev coj mus pauv cov as-ham ntawm cov ntshav thiab cov ntaub so ntswg ntawm lub cev. Osmotic siab thiab oncotic siab yog ob leeg hu ua 'Starling's rog' hauv physiology. Qhov sib txawv tseem ceeb ntawm lawv yog tias Osmotic siab yog lub siab tsim los ntawm cov kuab tshuaj yaj hauv dej ua haujlwm hla cov txheej txheem permeable, thaum Oncotic siab yog ib feem ntawm osmotic siab tsim los ntawm cov loj colloidal solute Cheebtsam. Yuav kom nkag siab qhov sib txawv ntawm ob lub zog no, peb yuav tsum xub saib seb lawv yog dab tsi thiab tom qab ntawd lawv pab li cas hauv peb lub cev.
Osmotic siab yog dab tsi?
Osmotic siab yog lub siab xav tau los tiv thaiv 'osmosis'. Osmosis yog cov txheej txheem uas cov kuab tshuaj molecules, xws li dej, nyob rau hauv ib qho kev daws yuav txav los ntawm ib cheeb tsam uas tsis muaj solute concentration mus rau ib cheeb tsam ntawm siab solute concentration nyob rau hauv ib tug semi-permeable membrane piv txwv li ib daim nyias nyias uas yog impermeable rau cov kuab tshuaj molecules tab sis permeable. Rau cov kuab tshuaj molecules. Tshwj xeeb, osmotic siab yog lub siab exerted los ntawm cov kuab tshuaj molecules tiv thaiv kev txav ntawm cov kuab tshuaj molecules los ntawm ib cheeb tsam uas tsis tshua muaj kuab concentration mus rau ib cheeb tsam ntawm siab solute concentration hla ib semi-permeable membrane. Osmotic siab kuj tseem hu ua hydrostatic siab, thiab nws nyob ntawm qhov concentration ntawm cov kuab tshuaj molecules ntawm ob sab ntawm ib nrab permeable membrane.
Oncotic siab yog dab tsi?
Oncotic siab yog ib feem ntawm osmotic siab, tshwj xeeb tshaj yog nyob rau hauv cov kua roj ntsha xws li ntshav. Oncotic siab yog exerted los ntawm colloids los yog, nyob rau hauv lwm yam lus, proteinaceous macromolecules ntawm plasma xws li albumin, globulin, thiab fibrinogen. Oncotic siab yog li no kuj hu ua 'colloid osmotic siab.' Albumin yog ntau tshaj ntawm tag nrho peb cov proteins thiab pab mus rau ib ncig ntawm 75% ntawm exerted oncotic siab. Tag nrho osmotic siab ntawm cov ntshav plasma paub tias yog 5535 mmHg, thiab oncotic siab nyob ib ncig ntawm 0.5% ntawm nws xws li ib ncig ntawm 25 mus rau 30 mmHg.
Osmotic siab thiab oncotic siab kuj hu ua Starling lub zog. Ob lub zog no ua ke tswj hwm qhov kev txav mus los ntawm cov dej thiab cov khoom noj ntawm cov ntshav plasma tawm ntawm cov hlab ntsha thiab mus rau hauv cov kua dej nruab nrab (ntawm cov hlab ntsha kawg) thiab lwm yam (ntawm venous kawg); Qhov tshwm sim no suav nrog Starling lub hauv paus ntsiab lus ntawm cov kua dej hloov pauv hloov pauv. Ob lub zog no ua haujlwm sib txawv ntawm ob qho tib si ntawm cov hlab ntsha thiab venous kawg ntawm lub txaj capillary kom coj mus rau kev sib pauv dej thiab cov as-ham hauv cov ntaub so ntswg. Nyob rau hauv lub arterial kawg ntawm lub capillary txaj, lub osmotic siab yog siab tshaj lub oncotic siab nyob rau hauv lub capillaries, li no dej thiab cov as-ham txav tawm ntawm lub capillaries mus rau hauv lub interstitial kua, conversely, nyob rau hauv lub venous kawg, lub osmotic siab yog qis dua li ntawm lub capillaries. oncotic siab nyob rau hauv lub capillaries thiab dej yog reabsorbed rau hauv lub capillaries los ntawm cov kua interstitial. Yog li, ob qho tib si osmotic thiab oncotic siab ua haujlwm tseem ceeb hauv cov ntshav ncig.
Kev lim thiab rov nqus rov muaj nyob hauv cov hlab ntsha.
Qhov txawv ntawm Osmotic Siab thiab Oncotic Pressure yog dab tsi?
Definition of Osmotic Pressure thiab Oncotic Pressure
Osmotic siab: Osmotic siab yog lub siab tawm los tiv thaiv kev txav ntawm cov kuab tshuaj dawb molecules hla ib daim nyias nyias mus rau hauv thaj tsam ntawm cov kua qaub siab.
Oncotic siab: Oncotic siab yog lub siab tawm los ntawm cov protein plasma colloidal kom reabsorb dej rov qab rau hauv cov ntshav.
Yam ntxwv ntawm Osmotic Siab thiab Oncotic Siab
Function
Osmotic siab: lub siab osmotic tiv thaiv kev txav ntawm cov dej hla daim nyias nyias los ntawm thaj tsam ntawm cov kua dej siab siab mus rau thaj tsam ntawm cov kua qaub qis.
Oncotic siab: Oncotic siab reabsorbs thiab txav dej hla ib daim nyias nyias los ntawm thaj tsam ntawm cov kua dej siab siab mus rau thaj tsam ntawm cov kua qaub qis.
Molecules
Osmotic siab: Nws yog tawm los ntawm qhov hnyav molecular molecules (cov proteins me, ions, thiab cov as-ham)
Oncotic siab: Nws yog exerted los ntawm loj molecular hnyav molecules (plasma proteins nrog Mw > 30000)
Image Courtesy: "Osmose en" los ntawm © Hans Hillewaert / (CC BY-SA 3.0) ntawm Wikimedia Commons "2108 Capillary Exchange" los ntawm OpenStax College - Anatomy & Physiology, Connexions Web site. https://cnx.org/content/col11496/1.6/, Jun 19, 2013.. (CC BY 3.0) via Wikimedia Commons
