Qhov sib txawv tseem ceeb ntawm urea thiab uric acid yog tias urea hauv tib neeg tau tawm nrog cov zis ua kua, thaum uric acid raug tso tawm raws li cov khoom nrog quav hauv cov noog thiab cov tsiaj reptiles.
Tib neeg lub cev tsim ntau yam khoom tsis tsim nyog thiab tshuaj lom hauv cov metabolism. Cov tshuaj no yuav tsum tau hloov mus rau cov tshuaj lom tsawg dua kom txog thaum lawv raug tshem tawm ntawm lub cev. Lub excretory system yog qhov tseem ceeb rau kev tshem tawm cov tshuaj no. Peb lub hauv paus excretory yog lub raum. Cov zis yog tsim nyob rau hauv ob lub raum, thiab qhov no yog thawj txoj kev ntawm excreting ntau tshaj thiab tsis tsim nyog tshuaj los ntawm peb lub cev. Ntxiv nrog rau lub raum, peb cov tawv nqaij kuj ua raws li lub cev excretory. Los ntawm hws, qee yam yog tawm. Ammonia, urea thiab uric acid yog nitrogenous excretory khoom uas tshem tawm ntawm lub cev li no.
Nyob ntawm qhov muaj dej thiab chaw nyob ntawm cov kab mob, hom khoom excretory lawv tsim txawv. Ammonia yog tshuaj lom heev, thiab nws yog tsim los ntawm cov khoom lag luam hauv cov protein metabolism. Qhov no yog cov khoom excretory ntawm cov ntses dej tshiab. Txij li thaum lawv tau yooj yim tshem tawm ammonia rau hauv dej, lawv muaj peev xwm dilute nws toxicity tab sis, nyob rau hauv tib neeg, cov dej muaj me ntsis qis dua ntses, thiab kom txog thaum nws tawm ntawm lub cev nws yuav tsum tau muab cia rau hauv. Yog li ntawd, cov khoom muaj kuab lom xws li ammonia hloov mus rau urea tsawg dua.
YUrea yog dab tsi?
Urea muaj cov qauv molecular ntawm CO(NH2)2 thiab cov qauv hauv qab no.
Nws yog carbamide nrog pab pawg ua haujlwm C=O. Ob pawg NH2 raug khi rau carbonyl carbon los ntawm ob sab. Urea yog ib txwm tsim nyob rau hauv cov tsiaj txhu hauv cov metabolism hauv nitrogen. Qhov no yog hu ua lub voj voog urea, thiab oxidation ntawm ammonia lossis amino acids tsim urea hauv peb lub cev. Feem ntau ntawm urea yog tawm los ntawm ob lub raum nrog cov zis, thaum qee qhov tawm hws. Cov dej solubility siab ntawm urea yuav pab tau thaum tshem tawm ntawm lub cev. Urea yog cov khoom tsis muaj xim, tsis muaj ntxhiab, thiab tsis muaj tshuaj lom.
Ntxiv rau qhov ua cov khoom lag luam metabolic, nws qhov kev siv tseem ceeb yog los tsim cov chiv. Urea yog ib qho ntawm feem ntau cov nitrogen tso chiv, thiab nws muaj cov ntsiab lus nitrogen siab piv rau lwm cov khoom siv nitrogenous chiv. Hauv av, urea hloov mus rau ammonia thiab carbon dioxide. Cov ammonia no tuaj yeem hloov mus rau nitrite los ntawm cov kab mob hauv av. Tsis tas li ntawd, urea yog siv los tsim cov khoom tawg xws li urea nitrate, thiab ua cov khoom siv raw los tsim cov tshuaj xws li plastics thiab adhesives.
YUric Acid yog dab tsi?
Uric acid yog ib qho cyclic compound uas muaj nitrogen. Nws cov mis yog C5H4N4O3 thiab muaj cov qauv hauv qab no.
Cov dej solubility ntawm uric acid feem ntau qis. Qhov no yog tsim nyob rau hauv purine (ib nucleotide) metabolism. Hauv tib neeg, uric acid uas tsim tawm tau tawm nrog cov zis. Qhov no yog lub ntsiab excretory khoom ntawm cov tsiaj reptiles thiab noog. Nyob rau hauv lawv, uric acid yog excreted nrog quav raws li ib tug qhuav huab hwm coj, yog li cov dej poob yog tsawg heev. Uric acid yog diprotic acid. Yog li ntawd, ntawm pH siab qhov tseem ceeb nws tsim ib urate ion.
Qhov txawv ntawm Urea thiab Uric Acid yog dab tsi?
Uric acid yog lub ntsiab nitrogenous excretory khoom ntawm cov tsiaj reptiles thiab noog whereas urea yog lub ntsiab excretory khoom ntawm tib neeg. Qhov sib txawv tseem ceeb ntawm urea thiab uric acid yog tias urea hauv tib neeg tau tawm nrog cov zis ua kua, thaum uric acid tau tawm hauv cov noog thiab cov tsiaj reptiles raws li cov khoom nrog quav. Ntxiv mus, uric acid yog bicyclic molecule thiab urea tsis yog li ntawd. Kev tsim cov uric acid xav tau ib txoj hauv kev muaj zog metabolic piv rau urea ntau lawm. Tsis tas li ntawd, dej poob thaum excreting uric acid qis dua cov dej poob nrog urea.
Summary – Urea vs Uric Acid
Uric acid yog lub ntsiab nitrogenous excretory khoom ntawm cov tsiaj reptiles thiab noog whereas urea yog lub ntsiab excretory khoom ntawm tib neeg. Qhov sib txawv tseem ceeb ntawm urea thiab uric acid yog tias urea hauv tib neeg tau tawm nrog cov zis raws li cov kua, thaum uric acid tau tawm hauv cov noog thiab cov tsiaj reptiles raws li cov khoom fecal.
Image Courtesy:
1. "Harnstoff" Los ntawm NEUROtiker - Tus kheej ua haujlwm (Public Domain) ntawm Commons Wikimedia
2. "Harnsäure Ketoform" Los ntawm NEUROtiker - Tus kheej ua haujlwm (Public Domain) ntawm Commons Wikimedia
