Lo lus nug no yog qhov txaus siab tsis yog rau peb xwb, tab sis ua ntej ntawm tag nrho cov kws tshawb fawb uas xav paub seb yuav tshwm sim yog tias koj txham qhib qhov muag. Txhua tus neeg nyob hauv peb lub ntiaj teb qee zaum txham, tab sis ob peb tus neeg tau xav txog vim li cas peb kaw peb lub qhov muag thiab yuav ua li cas yog tias peb txham nrog qhib. Cia peb pib nrog cov txheej txheem ntawm txham, uas tuaj yeem hu ua kev tiv thaiv kev tiv thaiv ntawm peb txoj kev ua pa. Thaum ib tug neeg txham, muaj ib tug ncaj qha irritation ntawm lub paj hlwb trigeminal, uas yog feem ntau ncaj qha koom nyob rau hauv tus txheej txheem ntawm innervation ntawm peb lub qhov muag. Yog tias cov hlab ntsha no nyob rau hauv ib qho chaw ntsiag to, ces peb lub qhov muag tuaj yeem qhib, tab sis ntawm nws qhov khaus me ntsis, txawm tias peb nyiam nws los yog tsis, lub qhov muag reflexively kaw. Yog li, xws li cov lus nug xav tau tshwm sim: yuav ua li cas yog tias koj txham nrog koj lub qhov muag qhib? Tag nrho cov ntsiab lus nyob rau hauv ib tug complex mechanical txheej txheem. Thiab xws li cov tshuaj tiv thaiv ntawm peb lub cev, ib tug yuav hais tias, tiv thaiv peb. Yuav ua li cas?
Lub hom phiaj nyuaj mus cuag
Yog tias peb xav txog ib pliag qhov siab thiab ceev ntawm huab cua peb exhale, ces lo lus nug yog yuav ua li cas yog tiastxham nrog qhib qhov muag, yuav tsis tshwm sim dua. Qhov ceev yog yuav luag 150 km ib teev! Thiab peb lub qhov muag tsuas tuaj yeem tsis tuaj yeem tiv taus lub zog hnyav thiab, raws li lawv hais, "yav tawm" ntawm lawv lub qhov (socket)! Qhov tseeb, ntawm chav kawm, yog ib hom kev npau suav, tab sis nws muaj nws tus kheej piav qhia. Nyob rau tib lub sijhawm, muaj ib txwm nyiam kev sim thiab cov neeg uas xav paub txog hauv lawv tus kheej cov tawv nqaij yuav ua li cas yog tias koj txham nrog koj ob lub qhov muag qhib. Tab sis ntawm no yog qhov teeb meem - nws yog qhov nyuaj heev los ua qhov no. Nws tuaj yeem txham nrog koj ob lub qhov muag qhib, tab sis qhov no yuav tsum tau siv lub hauv paus paj hlwb kom nco ntsoov. Thiab ob peb tus neeg ua tiav. Txij li cov xwm txheej tseem ceeb no nyuaj rau kev ua tiav, cov kws tshawb fawb muab ntau qhov laj thawj ntxiv vim li cas peb kaw peb lub qhov muag thaum peb txham. Paub tias peb nyuaj npaum li cas, thiab nkag siab lub hom phiaj uas cov txheej txheem no ua haujlwm, peb yuav tsis xav txog qhov yuav tshwm sim yog tias peb txham qhib qhov muag, thiab peb yuav zoo siab tias txhua yam tshwm sim raws li qhov yuav tsum tau ua.
Dab tsi piav txog qhov kaw ntawm daim tawv muag
txham nrog koj ob lub qhov muag qhib yog qhov nyuaj heev, vim tias peb qhov ntswg qhov ntswg, pob qhov muag, daim tawv muag, thiab cov qog lacrimal raug pierced los ntawm cov hlab ntsha trigeminal thiab nws qhov kawg. Yog tias qhov xaus no yog khaus, ces tag nrho cov kev tsis txaus siab tshwm sim nyob rau hauv daim ntawv ntawm blinking los yog txham. Tag nrho cov teeb liab sib koom ua ke hauv ib qho chaw - qhov no yog medulla oblongata. Lwm lub chaw ua haujlwm rau txham thiab kaw daim tawv muag yog nyob ze. Yog tias ib qho chaw, piv txwv li, txham, zoo siab, ces tus neeg nyob sib ze, los ntawm kev kaw daim tawv muag, tau txais kev qhib. Qhov no piav qhia peb cov tshuaj tiv thaiv: txham, peb pib kaw peb lub qhov muag involuntarily. Ib tug zoo xws li cov txheej txheem underlies lub mechanism ntawm lub teeb txham reflex. Yog tias lub teeb ci ntsa iab nkag rau hauv peb lub qhov muag, peb tsis tsuas yog kaw lawv xwb, tab sis peb kuj tuaj yeem pib txham yam tsis muaj kev ywj pheej. Raws li koj tau pom, txham yog ib qho nyuaj thiab nthuav mechanism.
