Video: Dab tsi yog qhov txhais ntawm myelin sheath?
2024 Tus sau: Michael Samuels | [email protected]. Kawg hloov kho: 2023-12-16 01:44
: lub insulating npog uas nyob ib puag ncig ib qho axon nrog ntau txheej kauv ntawm myelin , uas yog qhov tsis sib xws ntawm cov nodes ntawm Ranvier, thiab qhov ntawd ua rau kom nrawm dua uas lub paj hlwb tuaj yeem taug kev nrog lub axon. - tseem hu ua medullary sheath.
Ib yam li ntawd, lub luag haujlwm ntawm myelin sheath yog dab tsi?
Kev ua haujlwm ntawm Myelin Sheath Lub myelin sheath muaj ntau txoj haujlwm nyob rau hauv lub paj hlwb . Lub luag haujlwm tseem ceeb suav nrog kev tiv thaiv cov hlab ntsha los ntawm lwm yam hluav taws xob impulses, thiab ua kom lub sijhawm nws siv rau cov hlab ntsha mus rau qhov chaw. axon . Unmyelinated qab haus huv yuav tsum xa ib yoj mus rau tag nrho ntev ntawm cov hlab ntsha.
Tom qab ntawd, lo lus nug yog, dab tsi ua rau cov hlab myelin? Myelin yog ua los ntawm ob hom kev txhawb nqa ntawm tes. Hauv nruab nrab lub paj hlwb (CNS) - lub hlwb thiab tus txha nqaj qaum - cov hlwb hu ua oligodendrocytes qhwv lawv cov ceg zoo li txuas ntxiv ib puag ncig ntawm axons los tsim myelin daim tawv nqaij . Hauv cov hlab ntsha sab nraud ntawm tus txha caj qaum, Schwann cells tsim tawm myelin.
Ib yam li ntawd, nws tau nug, qhov txhais ntawm myelination yog dab tsi?
Myelination yog ib lo lus nyob rau hauv anatomy uas yog txhais raws li txheej txheem ntawm kev tsim a myelin txoj hlua nyob ib ncig ntawm cov hlab ntsha kom tso cai rau cov hlab ntsha txav mus sai dua. Piv txwv ntawm myelination yog tsim los ntawm myelin nyob ib ncig ntawm lub axons ntawm lub cev.
Myelin sheath zoo li cas?
Myelin thiab Koj Lub Siab myelin daim tawv nqaij qhwv nyob ib ncig ntawm cov fibers uas yog ib feem xov zoo li ib feem ntawm cov leeg hlwb. Cov sheath tiv thaiv cov fibers, hu ua axons, ntau heev nyiam rwb thaiv tsev nyob ib ncig ntawm cov xaim hluav taws xob. Thaum lub myelin daim tawv nqaij yog noj qab nyob zoo, cov hlab ntsha tau xa thiab tau txais sai.
Pom zoo:
Dab tsi tuaj yeem ua rau puas tsuaj rau myelin sheath?
Myelin sheaths yog lub tes tsho ntawm cov nqaij rog uas tiv thaiv koj lub paj hlwb. Yog tias koj muaj ntau tus kab mob sclerosis (MS), tus kab mob uas ua rau koj lub cev tiv thaiv kab mob ua rau koj lub hauv nruab nrab lub paj hlwb, koj lub paj hlwb puas tuaj yeem puas. Qhov ntawd txhais tau tias koj lub paj hlwb yuav tsis tuaj yeem xa thiab tau txais cov lus zoo li lawv yuav tsum tau ua
Dab tsi yog qhov txiaj ntsig ib txwm rau PaO 2 Dab tsi yog qhov txiaj ntsig rau kev txiav txim siab qhov hnyav ntawm hypoxemia?
Zoo li feem ntau qhov kev kho mob ib txwm muaj txiaj ntsig thiab ntau yam, lub ntsiab lus tuaj yeem sib txawv me ntsis, tab sis feem ntau cov ntsiab lus hauv qab no siv: Ua rau me me hypoxemia: PaO2 = 60 txog 79 mmHg. Qhov nruab nrab hypoxemia: PaO2 = 40 txog 59 mmHg. Hypoxemia hnyav: PaO2 <40 mmHg
Myelin sheath yog dab tsi?
Schwann hlwb
Peb lub luag haujlwm ntawm myelin sheath yog dab tsi?
Muaj nuj nqi ntawm Myelin Sheath Lub myelin sheath muaj tus lej ua haujlwm hauv lub paj hlwb. Lub luag haujlwm tseem ceeb suav nrog kev tiv thaiv cov hlab ntsha los ntawm lwm qhov kev siv hluav taws xob, thiab ua kom nrawm dua lub sijhawm nws siv rau cov hlab ntsha mus hla lub axon
Dab tsi yog qhov txawv ntawm qhov tseeb qhov pib thiab qhov sib txawv qhov pib?
Qhov pib tsis txaus yog qhov tsawg kawg ntawm kev txhawb siab xav tau rau ib tus neeg kom pom qhov kev txhawb siab 50 feem pua ntawm lub sijhawm. Qhov sib txawv ntawm qhov sib txawv yog qhov sib txawv me tshaj hauv kev txhawb nqa uas tuaj yeem kuaj pom 50 feem pua ntawm lub sijhawm