Qhov sib txawv tseem ceeb ntawm kev pom thiab rov ua dua yog qhov pom yog thawj kauj ruam ntawm kev tsim cov zis uas cov ntshav tau lim los ntawm glomerulus ntawm nephron thaum reabsorption yog theem thib ob ntawm cov zis tsim uas tsim nyog cov as-ham rov qab mus rau cov ntshav. los ntawm glomerular filtrate.
Metabolism, tsis tsuas yog tsim cov khoom tsim nyog, tab sis nws kuj tsim ntau yam khoom tsis xav tau hauv peb lub cev. Txawm li cas los xij, cov txheej txheem excretion ua haujlwm sai thiab tshem tawm cov khoom pov tseg ntawm peb lub cev. Lub raum yog lub luag haujlwm tseem ceeb uas ua rau lub cev tawm. Muaj ob lub raum hauv tib neeg.
raum muaj cov ntshav zoo, thiab nws tswj cov ntshav muaj pes tsawg leeg. Yog li, lub raum yog qhov tseem ceeb hauv homeostasis. Lub hauv paus txheej txheem thiab kev ua haujlwm ntawm lub raum yog nephrons. Txhua lub raum muaj txog ib lab nephrons. Txhua nephron muaj rau thaj tsam tseem ceeb: lub raum corpuscle, proximal convoluted tubule, descending limb ntawm lub voj ntawm Henle, ascending limb ntawm lub voj ntawm Henle, distal convoluted tubule thiab sau duct. Cov ntshav purification thiab tso zis feem ntau tshwm sim hauv nephrons. Muaj peb theem tseem ceeb ntawm kev tsim cov zis: ultrafiltration, selective reabsorption, thiab secretion.
Dab tsi yog Lim?
Kev lim dej yog thawj kauj ruam hauv kev tsim cov zis. Nws tshwm sim nyob rau hauv lub raum capsule nyob rau hauv ib tug siab. Lub siab yog los ntawm cov ntshav tso siab. Ntshav nkag mus rau hauv glomerulus ntawm kev kub siab, ncaj qha los ntawm lub plawv. Lub glomerulus yog ib pob ntawm capillaries nyob rau hauv lub raum capsule. Lub cheeb ntawm cov capillaries no tsawg dua li ntawm lub raum arteriole. Yog li ntawd, thaum cov ntshav nkag mus rau hauv lub nqaim capillaries, lub siab nce ntxiv nyob rau hauv lub raum capsule.
Daim duab 01: Lim
Ntxiv mus, txoj kab uas hla ntawm efferent arteriole tsawg dua li ntawm afferent arteriole txoj kab uas hla. Yog li, qhov no nce ntshav siab hauv glomerulus. Nyob rau lub sijhawm no, cov dej thiab cov molecules me me yog nyem tawm ntawm cov hlab ntsha los ntawm cov epithelium ntawm lub raum capsule mus rau sab hauv ntawm cov tshuaj ntsiav. Peb hu qhov no filtrate glomerular filtrate, thiab nws muaj cov ntshav, tab sis nws tsis muaj cov ntshav proteins loj, platelets, thiab lwm yam loj molecules.
Reabsorption yog dab tsi?
Lim tsim txog 125 cm3 ntawm glomerular filtrate ib feeb hauv tib neeg thiab 1.5dm3 tso zis ib hnub. Yog li ntawd, yuav tsum muaj ntau yam ntawm reabsorption. Tsis tas li ntawd, lub filtrate muaj ntau cov as-ham tseem ceeb rau lub cev. Yog li, reabsorption yog ib qho tseem ceeb ntawm lub sijhawm no txhawm rau txhawm rau tsim cov khoom noj uas tsim nyog thiab tshem tawm cov khoom pov tseg uas tsis tsim nyog. Cov molecules tseem ceeb yog reabsorbed rau cov ntshav los ntawm cov lim los ntawm kev xaiv reabsorption.
Daim duab 02: Reabsorption
Ntxiv mus, cov txheej txheem no tshwm sim raws li cov lim dej dhau los ntawm ntau ntu ntawm nephrons. Qee qhov chaw tshwj xeeb tau yoog rau reabsorb qee cov ntsiab lus nkaus xwb. Qhov loj tshaj reabsorption tshwm sim nyob rau hauv lub proximal convoluted tubule nyob rau hauv uas cov piam thaj, amino acids, ions, dej vitamins, cov tshuaj hormones, txog 80% ntawm NaCl yog reabsorbed rau cov ntshav. Lub voj ntawm Henle reabsorbs dej thiab sodium chloride. Vim lub reabsorption, filtrate ua concentrated. Thaum kawg, nws tawm hauv lub cev raws li tso zis.
Dab tsi yog qhov zoo sib xws ntawm Pom thiab Reabsorption?
- Kev lim thiab rov ua dua yog ob kauj ruam ntawm kev tsim cov zis.
- Ob leeg coj qhov chaw hauv nephrons.
Dab tsi yog qhov txawv ntawm Kev Pom Zoo thiab Reabsorption?
Kev lim dej yog thawj kauj ruam ntawm kev tsim cov zis uas tshwm sim hauv glomerulus ntawm nephron. Whereas, reabsorption yog kauj ruam thib ob uas tshwm sim hauv lwm qhov chaw ntawm nephron. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm kev pom thiab reabsorption. Ntshav lim los ntawm glomerular capillaries mus rau lub raum capsule. Thaum lub glomerular filtrate taug kev raws lub zeem muag convoluted tubule, nqis qis ntawm lub voj voog ntawm Henle, nce toj ceg ntawm lub voj ntawm Henle thiab cov tubule distal convoluted, cov khoom noj tsim nyog tau rov qab los rau cov ntshav. Ntxiv mus, lwm qhov sib txawv ntawm kev pom thiab reabsorption yog qhov pom tsis yog ib txoj kev xaiv heev, tab sis reabsorption yog xaiv heev.
Cov infographic hauv qab no qhia txog qhov sib txawv ntawm kev pom thiab rov ua dua.
Summary – Lim vs Reabsorption
Kev lim dej thiab rov nqus dej yog ob kauj ruam tseem ceeb hauv kev tsim cov zis. Filtration tshwm sim ua ntej thiab tom qab ntawd reabsorption tshwm sim. Thaum lub sij hawm filtration, cov ntshav lim hauv lub raum capsule thiab tsim cov glomerular filtrate. Thaum lub sij hawm reabsorption, cov as-ham tsim nyog nyob rau hauv glomerular filtrate yog reabsorbed rov qab mus rau cov ntshav los ntawm cov seem ntawm cov nephron. Tsis zoo li filtration, reabsorption yog xaiv. Yog li, qhov no yog cov ntsiab lus ntawm qhov sib txawv ntawm kev pom thiab reabsorption.
