Rau excitable ntaub so ntswg nyob rau hauv tib neeg lub cev yog lub paj hlwb, secretory thiab tej nqaij. Txawm li cas los, lub tom kawg yog txawv los ntawm tus so ntawm lub cim khoom teejtug uas yog contraction vim lub nyob rau hauv lub cell qauv ntawm lub microfilaments ntawm lub tshwj xeeb cov nqaijrog - myosin, actin, tropomyosin. Qhov no saib kuas lub txij nkawm ntawm tib neeg hwj tau lub cev, lub zog nyob rau hauv qhov chaw, los txhawb khoom noj khoom haus bolus los ntawm tus mob huam, ntshav, thiab tshaj. Nyob rau hauv lub histological nta, zog thiab keeb kwm yog ib tug faib mus rau hauv tus thiab striated nqaij ntaub so ntswg thiab rau ib txhia sau phau ntawv qhia hais tias nta nyob rau hauv lub thib peb mob subsp. Txawm li cas los, nws yuav tsum tau to taub contractile ntsiab tshwm sim tawm lub xwb paus ntawm cov ntaub so ntswg, thiab lawv yuav tsis ua hauj lwm zoo tsis muaj ib tug tuab network ntawm cov hlab ntsha uas muab qhov tus me nyuam ntawm ib tug loj npaum li cas ntawm cov pa thiab lub zog tseem ceeb tiv thaiv plhaub - sarcolemma thiab qhov cuab lub zog unformed xoob connective cov ntaub so ntswg.
Striated
Striated nqaij, mas tshwm sim tawm lub tag nrho skeletal nqaij thiab pob qij txha pub zog thiab muaj hwj tau lub cev. Ntxwv thiab haumxeeb chav tsev ntawm ib tug sarcomere, thiab lawv muaj li nyob rau hauv lem ntawm myosymplasts - fibers tsim los ntawm cov phiajcim ib tug plurality ntawm ib tug neeg lub hlwb thaum lub sij hawm txawv. Nyob rau histological npaj striated nqaij yog yooj yim distinguished los ntawm tej tub ntxhais thiab striation yog vim li cas lawv tau txais lawv lub npe. Ib qho tseem ceeb muaj nuj nqi ntawm ib tug kub tiam, thiab yog li ntawd lub kub txo ib tug neeg lawv tshee hnyo rau tshwm sim. Tsis tas li ntawd striated nqaij cov ntaub ntawv thiab myocardial qauv, tsuas cardiomyocytes txawv tsis symplasts. Thaum lub tshuab kuaj kab, lawv yog fusiform mononuclear hlwb. Lawv muab faib raws li lawv kev khiav dej num ntawm kev ua hauj lwm (yeej los ntawm tus xov tooj ntawm) kev thiab secretory. Nws yog ua tsaug rau lub thib ob, mob striated nqaij muaj cov cuab yeej ntawm automatism, piv txwv li muaj lub peev xwm rau nws tus kheej-ntsws, kom ntseeg tau laaj ntawm lub plawv. Qhov thib peb hom cell yog lub site ntawm synthesis ntawm hormone zoo li tshuaj, nyob rau hauv particular nws yog ib qho atrial natriuretic uas ua rau sawvdaws muaj zog diuresis.
tus
Yog hais tias muab lub zog ntawm tib neeg tej nqaij - striated, lub kom ntawm txoj hnyuv thiab urogenital huam, yuav txo tau ntawm vascular thiab bronchial phab ntsa muaj ib tug tus mob. Nws yog txawv los ntawm lub suab, tus kwv tij slowness, ib tug high degree ntawm stretchability thiab regenerative muaj peev xwm, raws li zoo raws li autonomic innervation. Qhov no elongated mononuclear hlwb, tsis muaj striations, thiab muaj ntau ntawm actin thiab collagen nyob rau hauv cov qauv. Txhua myocyte coated nyias qab daus membrane, thiab cov pab pawg - endomysial xoob los ntawm lus connective cov ntaub so ntswg.