Imibuzo Yezibonelo kanye Nengxoxo Yesistimu Yezinzwa Ezungezile
Uhlelo lwezinzwa oluseceleni (i-PNS) luyingxenye ebalulekile yesimiso sezinzwa, oluxhumanisa uhlelo lwezinzwa oluphakathi nomzimba wethu wonke. Ukuqonda i-PNS kubalulekile hhayi nje kubafundi bezokwelapha kanye ne-biology, kodwa nakunoma ubani onesifiso sokuqonda ukuthi umzimba womuntu usebenza kanjani. Kulesi sihloko, sizoxoxa ngezinye zezinkinga eziyisibonelo kanye nengxoxo yazo ehlobene ne-PNS.
Isingeniso kuhlelo lwezinzwa oluseceleni
Uhlelo lwezinzwa oluseceleni luqukethe imicu yezinzwa ephuma ebuchosheni nasentanjeni yomgogodla, kanye ne-ganglia etholakala ngaphandle kohlelo lwezinzwa oluphakathi. Uhlelo lwezinzwa oluseceleni luhlukaniswe izingxenye ezimbili eziyinhloko: uhlelo lwezinzwa oluseceleni kanye nohlelo lwezinzwa oluzimele. Uhlelo lwezinzwa oluseceleni lunesibopho sokunyakaza ngokuzithandela kanye nokudluliselwa kolwazi lwezinzwa, kuyilapho uhlelo lwezinzwa oluzimele lulawula imisebenzi yomzimba ezenzakalelayo, njengokushaya kwenhliziyo kanye nokugaya ukudla.
Isibonelo Umbuzo 1: Izinzwa Nezinzwa
Umbuzo: Chaza umehluko phakathi kwama-neuron ezinzwa nama-motor neurons ohlelweni lwezinzwa oluseceleni.
Ingxoxo:
Ama-neuron ezinzwa kanye nama-neuron okunyakaza anezindima ezahlukene ohlelweni lwezinzwa oluseceleni. Ama-neuron ezinzwa anesibopho sokuthwala ulwazi oluvela kuma-receptor ezinzwa (njengesikhumba, amehlo, nezindlebe) luye ohlelweni lwezinzwa oluphakathi. Le nqubo isiza imizimba yethu ukuba isabele ezintweni zangaphandle, njengokuthinta nomsindo.
Ngokuphambene nalokho, ama-motor neurons adlulisela izimpawu ezivela ohlelweni lwezinzwa oluphakathi kuya kubenzi bemisebenzi efana nemisipha nama-gland. Lo msebenzi uvumela izimpendulo ezinkingeni, njengokuhambisa isandla lapho uthinta into eshisayo.
Umehluko omkhulu phakathi kwalokhu okubili yindlela okuthuthwa ngayo ulwazi: ama-neuron ezinzwa aya ohlelweni lwezinzwa oluphakathi kanti ama-motor neurons avela ohlelweni lwezinzwa oluphakathi aya kwezinye izingxenye zomzimba.
Isibonelo Umbuzo 2: Uhlelo Lwezinzwa Oluzimele
Umbuzo: Qamba izingxenye ezimbili eziyinhloko zesimiso sezinzwa esizimele bese uchaza imisebenzi yazo.
Ingxoxo:
Uhlelo lwezinzwa oluzimele luhlukaniswe izingxenye ezimbili eziyinhloko: uhlelo lwezinzwa oluhambisana nozwela kanye nohlelo lwezinzwa oluhambisana nozwela oluhambisana nozwela.
1. Uhlelo Lwezinzwa Olunozwela: Le ngxenye yesimiso sezinzwa ilungiselela umzimba izimo eziphuthumayo noma ezicindezelayo, ezivame ukubizwa ngokuthi impendulo “yokulwa noma yokubaleka”. Umsebenzi wozwela wandisa ukushaya kwenhliziyo, wandisa abafundi, futhi uvimbela ukugaya ukudla ukuze kugxilwe amandla ekubhekaneni nesimo esiphuthumayo.
2. Isistimu Yezinzwa Ene-Parasympathetic: Ngokuphambene nalokho, le ngxenye inesibopho “sokuphumula nokugaya,” okubuyisela umzimba esimweni sokuzola ngemva kokuba usongo seludlulile. Umsebenzi we-parasympathetic wehlisa izinga lokushaya kwenhliziyo, unciphise abafundi, futhi wandise umsebenzi wokugaya ukudla.
Lezi zingxenye ezimbili zisebenza ngokuphambene ukuze kugcinwe ibhalansi emzimbeni.
Isibonelo Umbuzo 3: Ukuzivumelanisa Nezimo
Umbuzo: Kusho ukuthini nge-reflex arc, bese unikeza isibonelo.
Ingxoxo:
I-reflex arc iyindlela ye-neural elawula impendulo ye-reflex. Le nqubo ivame ukuhilela izindlela ze-neuronal ezisheshayo kakhulu futhi ayidingi ukungenelela kobuchopho obuphakathi, okusho ukuthi i-reflex ingenzeka ngokuzenzakalelayo.
Isibonelo esaziwa kakhulu se-reflex arc yi-patellar (knee) reflex. Lapho i-tendon engaphansi kwedolo icindezelwa, izimpawu zokuzwa zithunyelwa emgogodleni, okubangela ama-motor neurons ukuba abangele imisipha yamathanga ukuba inciphe, ekugcineni okubangela ukuba umlenze uphakame.
Isibonelo Umbuzo 4: Ukuphazamiseka Kwesistimu Yezinzwa Eseduze
Umbuzo: Chaza inkinga eyodwa yezempilo engathinta uhlelo lwezinzwa oluseceleni.
Ingxoxo:
Isibonelo esisodwa sokuphazamiseka kwesistimu yezinzwa engaphandle yi-peripheral neuropathy. Lesi simo sibangelwa ukulimala kwemicu yezinzwa engaphandle, okungabangelwa yizici ezahlukahlukene, okuhlanganisa isifo sikashukela, ukutheleleka, kanye nokulimala ngokomzimba.
Izimpawu ze-peripheral neuropathy zifaka phakathi ukuqaqamba, ukungazweli, ubuthakathaka bemisipha, kanye nobuhlungu ezandleni nasezinyaweni. Ukuxilongwa kanye nokwelashwa kuncike embangela eyisisekelo futhi kungabandakanya ukuphathwa kobuhlungu, ukwelashwa ngokomzimba, kanye nokuphatha izimo eziyisisekelo ezifana nesifo sikashukela.
Isibonelo Umbuzo 5: Ama-Neurotransmitter
Umbuzo: Iyini indima yama-neurotransmitter ohlelweni lwezinzwa oluseceleni, futhi unikeze isibonelo esisodwa saleso si-neurotransmitter?
Ingxoxo:
Ama-neurotransmitter angama-molecule amakhemikhali avumela ukudluliselwa kwe-synaptic kusuka ku-neuron eyodwa kuya kwenye noma kwamanye amaseli e-effector. Esimisweni sezinzwa esiseceleni, ama-neurotransmitter adlala indima ebalulekile ekuxazululeni izimpawu phakathi kweziphetho zezinzwa nezicubu eziqondiwe.
Isibonelo se-neurotransmitter ehilelekile ohlelweni lwezinzwa oluseceleni yi-acetylcholine. Esistimu yezinzwa ye-somatic, i-acetylcholine ikhishwa kuma-motor neurons iye emisipheni yamathambo, okubangela ukufinyela kwemisipha. Esistimu yezinzwa ye-parasympathetic, i-acetylcholine yehlisa izinga lokushaya kwenhliziyo futhi yandisa umsebenzi wokugaya ukudla.
Isiphetho
Ukuqonda uhlelo lwezinzwa oluseceleni, okuhlanganisa imisebenzi yalo kanye nezingxenye zalo, kubalulekile ekuqondeni ukuthi umzimba wethu usabela kanjani futhi uxhumana kanjani nendawo ezungezile. Izibonelo zezinkinga kanye nezingxoxo esizihlanganisile zinikeza umbono oyisisekelo womsebenzi wohlelo lwezinzwa oluseceleni, kusukela endimeni yama-neuron nama-neurotransmitter kuya ezinkingeni ezingaluthinta. Lolu lwazi alubalulekile nje kuphela kulabo abaphishekela imisebenzi yezokwelapha kodwa futhi luzuzisa wonke umuntu ekugcineni impilo enhle nokuqonda izimpendulo zomzimba ezinkingeni ezahlukahlukene.
