Ukunwaya i-reflex: kungani inja inyakazisa izidladla zayo lapho iklwejwa

Inja inendawo enomlingo, ukunwaya kwayo okuyenza inyakazise izidladla zayo. Kodwa yini ebangela lokhu kucabanga - ingabe uyakitaza noma uyaluma? Kungani izinja zinyakazisa izidladla zazo lapho unwaya isisu sakho - azijabulisi?

Ngemva kokwenza uchungechunge lwezifundo, ososayensi bathole isizathu sesayensi sokuthi kungani izinja zisabele ngendlela engavamile ekuklwebheni okudala okuhle.

Iyini i-reflex yokuklwebheka ezinjeni

Ngokusho kwe-Popular Science, i-scratch reflex iwukusabela okuzenzakalelayo okuvikela izinja kumazeze, imikhaza, neminye imithombo yokucasuka. Indawo yemilingo eyisaga ayilutho nje ngaphandle kweqoqo lezinzwa ngaphansi kwesikhumba. Isimo esithi "uma nginwaya inja, idonsa isidladla sayo" kwenzeka ngoba umnikazi uthinta le ndawo. Izinzwa zicushiwe futhi zithumele isignali emlenzeni ongemuva ngokusebenzisa intambo yomgogodla ukuze ziqale ukukhahlela ukuze kuqedwe umthombo wokucasuka.

Lokhu akusho ukuthi inja ayiyithandi. Isimo sengqondo sesilwane esifuywayo mayelana nokunwaya okunjalo singaqondwa ngokunaka ulimi lwaso lomzimba, ngokusho kwe-Animal Planet. 

Izilwane ezingakuthandi noma ezikhathele yile mizwa evusa inkanuko ngokuvamile zizama ukusuka. Futhi inja, evame ukulala ngomhlane ukuze iveze isisu sayo, ibika ukuthi ikhululekile futhi ilungele umnikazi wayo ukuba anwaye isisu sayo.

Kungani i-reflex ivame ukusebenza lapho unwaya isisu

Inja inyakazisa izidladla zayo lapho unwaya isisu sayo. Ngaphandle kokungavamile, i-reflex yokuklwebheka ezinjeni ivame ukusebenza ngale ndlela. Lokhu kungenxa yokuthi amaqoqo ezinzwa eziphethwe abangela le reflex atholakala kuphela endaweni yesihlalo sehhashi lesisu futhi abizwa ngokuthi “inkundla yokwamukela i-reflex,” kubhala i-DogDiscoveries.com.

Ithiyori eyodwa yokuthi kungani le nerve reflex itholakala kule ndawo ukuthi ayihambanga noma ivikelwe njengezinye izingxenye zomzimba. Lokhu kuyenza ibe sengozini kakhulu kuma-parasites nezinye izinto ezicasulayo.

Isebenza kanjani i-reflex yokuklwebha?

Ekuqaleni kwekhulu lesi-XNUMX, isazi sezinzwa saseNgilandi uSir Charles Sherrington wamangala ngalokhu kuziphatha ezinjeni futhi wanikela ngezinsizakusebenza eziningi ekuyifundeni.

Ngokwemiphumela eshicilelwe encwadini yakhe ethi Integrative Activity of the Nervous System, ukuklwebheka ezinjeni kunezigaba ezine:

1. isikhathi sokulibaziseka. Ukuma kancane phakathi kwesikhathi lapho umnikazi eqala ukunwaya indawo yomlingo yenja kanye nesikhathi lapho udladla lwakhe luqala ukudlikizela. Lokhu kubambezeleka kubangelwa ukuthi kuthatha isikhathi ukuthi izinzwa zithumele isignali ngomgogodla ukuya ebuchosheni futhi ibuyisele isignali emlenzeni futhi isebenze ukunyakaza.

2. Kulungele. Lesi yisikhathi esithathayo ukuze umlenze uthole isivinini. Ukunyakaza konyawo kuvame ukuqala kancane bese kuba namandla njengoba umnikazi eqhubeka nokunwaya noma ukuhlikihla indawo yomlingo.

3. Ukukhishwa okulandelayo. Lokhu kubhekisela ezimweni lapho ukunyakaza konyawo kuqhubeka ngemva kokuba umnikazi eseqedile ukunwaya noma ukususa isandla sakhe. Njengoba nje kuthatha isikhathi ukuthi isignali ifike emlenzeni futhi iyitshele ukuthi iqale ukukhahlela, isignali yokuma nayo ayifiki lapho ngaso leso sikhathi.

4. Ukukhathala. Ukunwaya isikhathi eside endaweni efanayo kungaholela ekufipheleni kwe-reflex. Ngenxa yalesi sizathu, ngezinye izikhathi ukunyakazisa kwezidladla kunciphisa ijubane futhi kuma ngisho noma umnikazi eqhubeka nokunwaya isilwane. I-reflex idinga isikhathi ukuze ilulame futhi iphinde isebenze.

I-reflex yenja ingase izwakale ihlekisa, kodwa ibalulekile ekuvikeleni isilwane esifuywayo kuma-parasite futhi inikeza ulwazi olubalulekile mayelana nempilo yaso yemizwa. Ukuthi inja iyakwazi lokhu noma ijabulela ukuklwejwa endaweni yemilingo, cishe kunento eyodwa eqinisekile: ukunwaya kwesisu kuyinjabulo enkulu kuyo.