2024 Tus sau: Elizabeth Oswald | [email protected]. Kawg hloov kho: 2024-01-13 00:07
Kev sib piv, lub paj hlwb peripheral (PNS) axons tau yooj yim rov tsim dua, tso cai rov qab ua haujlwm tom qab peripheral paj puas tsuaj.
Cov neurons twg tuaj yeem tsim dua tshiab?
Motor neurons, uas muaj cov txheej txheem uas nyob hauv ob qho tib si CNS thiab PNS, rov tsim dua tshiab, txawm li cas los xij. Thaum tsis muaj kev cuam tshuam, lub cev muaj zog neurons yog ib qho ntawm CNS neurons nkaus xwb los tsim kho tom qab axotomy.
PNS puas kho nws tus kheej?
Qhov sib txawv tshaj plaws ntawm ob lub tshuab yog tias, tsis zoo li cov hlab ntsha peripheral, ib zaug tib neeg lub hlwb lossis qaum qaum raug mob, lawv yog qhov tseem ceeb tsis muaj peev xwm rov tsim dua tshiab. … Lub paj hlwb, txawm li cas los xij, tau txais qhov txuj ci tseem ceeb los tsim kho thiab kho lawv tus kheej.
Cov neurons puas tuaj yeem rov tsim dua yog tias puas lawm?
Thaum cov hlab ntsha peripheral raug mob, kev puas tsuaj axons rov tsim muaj zog thiab tuaj yeem rov ua dua qhov deb ntawm ntau centimeters lossis ntau dua. Raws li qhov muaj txiaj ntsig zoo, cov axons regenerated no kuj tseem tuaj yeem rov tsim cov kev sib txuas synaptic nrog lawv lub hom phiaj nyob rau hauv periphery.
Nws siv sijhawm ntev npaum li cas rau cov hlab ntsha peripheral kom rov tsim dua?
Ntawm qhov nruab nrab, tib neeg peripheral qab haus huv rov tsim dua ntawm tus nqi ntawm kwv yees li 1 nti ib hlis. Qhov no tus nqi yog ze rau qhov qeeb axonal thauj tus nqi thiab yog feem ntau dictated los ntawm qhov yuav tsum tau txav neurofilaments thiab microtubules, lub tsev blocks ntawm axons, los ntawm lubntev axons (6, 7).
Pom zoo:
Koj puas tuaj yeem siv kev tsim kho tshiab ua lus qhia?
verb (siv tsis khoom), in·no·vat·ed, in·no·vat·ing. verb (siv nrog cov khoom), in·no·vat·ed, in·no·vat·ing. … los qhia (ib yam tshiab) rau lossis zoo li thawj zaug: txhawm rau tsim kho lub khoos phis tawj ua haujlwm. Is innovate a verb or a noun?
Qhov twg yog tus tshiab nkauj tshiab lossis tshiab nkauj tshiab?
Ntxhais nkauj tshiab yog tus neeg nyuam qhuav sib yuav. Yog tias koj nyuam qhuav sib yuav tag kis no, koj thiab koj tus txij nkawm tshiab yog tus tshiab. Zoo siab! Qee tus neeg yuav xav txog koj ib tug tshiab nkauj nraug ntau xyoo tom qab lub tshoob tiag.
Puas unipolar neurons rov tsim dua?
Unipolar neurons tsuas muaj ib txheej txheem thiab pom feem ntau hauv cov pob txha tsis muaj zog. Bipolar neurons feem ntau yog oval nyob rau hauv cov duab thiab muaj ob txheej txheem, ib tug dendrite uas tau txais cov cim feem ntau los ntawm lub periphery thiab ib tug axon uas propagate lub teeb liab mus rau lub hauv paus paj hlwb.
Koj puas tuaj yeem tsim lub vev xaib rov tsim dua?
Tus Nqi Txhim Kho Lub Vev Xaib Hloov kho thiab txhim kho rau lub vev xaib yuav raug sau npe, tab sis tsuas yog ntxiv ua haujlwm ntxiv. Yuav ua li cas lub vev xaib tshiab tuaj yeem ua lag luam? Ib lub vev xaib tshiab nkaus xwb, lossis ntxiv qhov tseem ceeb ntawm kev ua haujlwm tshiab, xav tau kev tshuaj xyuas ntawm cov nqi koom nrog ntau theem ntawm kev txhim kho.
Vim li cas Planaria tuaj yeem tsim dua tshiab?
Key rau planarians 'regenerative peev xwm yog cov hlwb muaj zog hu ua pluripotent qia hlwb, uas ua rau ib feem tsib ntawm lawv lub cev thiab tuaj yeem loj hlob mus rau txhua qhov tshiab ntawm lub cev. Tib neeg tsuas muaj pluripotent qia hlwb thaum lub sij hawm embryonic theem, ua ntej yug.
