Alveoli (hu ua yog alveolus) yog me me, me ntsis cua hlawv tob hauv cov ntsws. Lawv zoo li cov kab me me ntawm txiv hmab txiv ntoo ntawm qhov kawg ntawm cov hlab ntses hauv cov ntsws.
Cov Alveoli Muaj Nyob Hauv Lub Ntsws Lawm?
Cov neeg tshawb xyuas saib ntawm 6 pawg neeg laus lub ntsws tau pom tias cov naj npawb ntawm alveoli muaj thaj tsam li ntawm 480 plhom, thaj tsam li ntawm 274 lab nyob rau qhov tsawg kawg rau 790 plhom nyob rau qhov siab kawg.
Tus naj npawb ntawm alveoli tau txheeb rau tag nrho me me ntawm lub ntsws kawm.
Qhov luaj li cas ntawm ib tus alveolus muaj kwv yees diameter ntawm 200 microns, tsis hais txog ntawm lub ntsws loj npaum li cas. Raws li tus taw tes ntawm qhov siv, ib qho micron yog ib vam vam ntawm ib lub 'meter'. Qhov lub cev ntawm ib tug tib neeg cov plaub hau yog li 70 microns, yog li ib tug alveolus yuav tsum sib npaug ntawm lub cheeb ntawm peb cov tib neeg plaub mos mos muab tso ua ke. Me quav!
Alveoli muaj collagen thiab elastin. Collagen muaj kev ruaj khov rau cov pa cua qauv thiab elastin, thaws khoom noj. Thaum twg cov pa hauv nqus mus rau hauv cov ntsws, elastin tso cai rau cov hlab ntses loj dua, thiab thaus lub exhalation, lub caij nplooj ntoo hlav rov qab los rau lawv cov me me.
Tag nrho thaj tsam ntawm tag nrho cov pob alveoli hauv kev noj qab haus huv laus hauv lub ntsws yog kwv yees li 70 square metres, los yog 800 square feet (kwv yees li ntawm ib nrab ntawm qhov ntaus pob tesniv).
Kev ua ntawm Alveoli
Tshaj 70 feem pua ntawm sab nraud ntawm thaj chaw ntawm lub ntsws alveoli yog them nrog cov hlab ntsha me me.
Cov capillaries thiab cov phab ntsa ntawm alveoli qhia ib daim nyias nyias nyias uas tso pa tawm hauv pa cua kom dhau los ntawm phab ntsa ntawm alveoli thiab nkag mus rau hauv cov hlab ntshav ntawm lub capillaries. Tib lub sij hawm, carbon dioxide raug thawb nyob rau hauv tib txoj kev thaum cov pa pa tawm.
Tus nqi tag nrho ntawm qhov chaw muaj nyob rau qhov roj / ntshav kev sib pauv no yuav txiav txim seb tus neeg tau ua pa npaum li cas.
Nyob rau hauv ib tus neeg laus noj qab nyob zoo, nws muaj ntau qhov chaw muaj nyob rau qhov txheej txheem no.
Haus luam yeeb
Txij lub sij hawm, cov co toxins los ntawm nqus pa luam yeeb ua rau cov ntsa nyias ntawm lub alveoli, tawm hauv cov huab cua loj dua, tsawg dua. Cov ntawv tseem yuav pib poob lawv cov neeg thim rov qab, ua rau nws nyuaj rau nqa cov pa oxide thiab tshem tawm carbon dioxide. Ob qho tib si tuaj yeem ua tau rau hauv cov ntsws. Nyob hauv ib tus neeg haus luam yeeb, txoj haujlwm no pib qhov pib ntawm kev xav ntawm emphysema, ib daim COPD.
Kev puas tsuaj ntawm kev mob ntsws tsis tuaj yeem hloov tsis tau. Thaum tshav ntuj cua tawg lawm, lawv tsis khov kho. Txawm li cas los xij, yog tias cov pa luam yeeb tau nres sai sai, qhov kev puas tsuaj yuav raug txwv. Yog tias kev haus luam yeeb tseem muaj ntxiv, yuav muaj qhov point uas qhov kev mob ntsws loj zuj zus tuaj txawm tias tus neeg tsis haus luam yeeb lossis tsis haus.
Zoo vim li cas tsis txhob haus luam yeeb tam sim no
Cov lus qhia ntawm no yog kom txiav luam yeeb sai li sai tau thaum koj tuaj yeem ua tau. Txhua txhua tus luam yeeb uas koj haus luam yeeb ua rau koj lub cev ua ntau yam. Kev haus luam yeeb yog chock puv ntawm chemicals ua rau mob cancer thiab muaj tshuaj lom. Qee cov tib neeg muaj kev kub ntxhov, thiab muaj pov thawj tias lawv tawm ntawm cov pa tawm hauv npau npau ntawv hauv cov neeg haus luam yeeb. Cov neeg tshawb nrhiav ntseeg tias qhov no yog qhov zoo tshaj plaws rau qhov kev pheej hmoo ntawm mob ntsws cancer.
Thaum nqus tau cov pa, co toxins hij ib lub caij los ntawm koj cov hlab ntsha ntawm lub qhov cub uas lawv nkag tau rau txhua yam hauv koj lub cev. Nws tsis xav tias kev haus luam yeeb yog txuas rau ntau hom kab mob .
Tsis muaj dab tsi uas yuav kom haus luam yeeb. Peb xav tias peb txaus siab rau nws , tab sis nws yog ib qho kev tiv thaiv , dawb thiab yooj yim.
Qhov chaw:
National Institutes of Health. Tus Number of Alveoli nyob hauv tib neeg lub ntsws. http://www.ncbi.nlm.nih.gov/pubmed/14512270. Lub Cuaj Hli 25, 2003.
National Institutes of Health. Lub Plawv Lub Plawv, Lub Ntsws thiab Lub Tsev Ntshav. Cov Kab Mob Ntsws. http://www.nlbi.nih.gov/health/health-topics/topics/hlw/system. Kho tshiab lub Xya hli ntuj 17, 2012.