Inkqubo wentliziyo Uhanjiso: isakhiwo, umsebenzi kunye neempawu yokwakheka kunye nokomzimba

Luphawu ebalulekileyo yomsebenzi kwemisipha intliziyo yi unciphiso automatism. kakuhle umsebenzi wentliziyo, olusekelwe phezu ucutheko ezilandelelana ngokwamanani kunye ukucuthwa inwebu yesihlunu kwe imithambo kunye ventricles, eqhuba inkqubela-luvo kulawulwa yi isakhiwo apho isakhiwo enzima.

Inkqubo conductive intliziyo - yindlela ebalulekileyo ukuqinisekisa ukusebenza kumzimba womntu, kuqulethe sazi wenkunkuma (ipacemaker) nengxelo ezintsonkothileyo ngamnye eyenzelwe kwimijikelo innervation iqhosha. Equka isakhiwo yeselula, olusekelwe kumsebenzi P-iiseli ne T-iiseli, lulungiselwe ukuqalisa nokunxibelelanisa ucutheko intliziyo zamagumbi endawo intliziyo. Uhlobo lokuqala iiseli inemisebenzi ebalulekileyo komzimba le automaton - abanamandla izishunqulelo ezinesingqi ngaphandle naluphi uxhulumaniso express kunye nempembelelo yazo naziphi ezenzeka ngaphandle.

iiseli T, nayo, sibe contractile ngokwentshukumisa transmission umthamo eyenziweyo P-iiseli ukuya myocardium, eqinisekisa ukusebenza inkathazo-free. Ngenxa yoko, inkqubo kokuqhutywa intliziyo, olusekelwe phezu amalungu intsebenziswano kakuhle kula maqela mabini eziseleni, yindlela zebhayoloji enye ngokokwakheka zibandakanyiwe unit intliziyo.

Ndiqhuba inkqubo wentliziyo yabantu iqulathe amacandelo ezininzi ezisebenzayo: esiludumbo sinoatrial kunye atrioventricular kunye bundle block isebe ngasekunene nangasekhohlo neentungo, eziphela ngo imicu Purkinje. Sinoatrial (sinus) node ibekwe intendelezo ekunene, kukho ubunzima encinane kwimicu izihlunu shape okweqanda. Kungenxa kule candelo, oqalisa nenkqubo kokuqhutywa intliziyo, uzikise iminqweno luvo, ebangela iimpendulo contractile ngentliziyo yam yonke. Automata node normal sinoatrial ithathwa ukusuka pulses amahlanu ukuya asibhozo ngomzuzu.

Icandelo Atrioventricular ibekwe ngezantsi endocardium kwi ngomva icandelo ekudibaneni interatrial, kukho umsebenzi obalulekileyo kokulibazisa, ukuhluza kunye nokunikezelwa pulses engenayo eyenziwe kwaye ithunyelwe esiludumbo sinoatrial. inkqubo Uhanjiso wentliziyo wenza imisebenzi zolawulo nosasazwayo eyinikwe icandelo noshowo - esiludumbo atrioventricular.

Imfuneko loo msebenzi ngenxa yokuba yomtshangatshangiso neemvakalelo-luvo, nangoko okwandisa ngenkqubo imithambo kwaye ibangele impendulo contractile impendulo yawo ngoko nangoko ukungena kungena ventricles zentliziyo ayikho nako, kuba myocardium atrial le ventricles wahluliwe izihlunu ezinezikhondo, musa ungaphoswa amaza luvo. Kwaye kuphela kummandla esiludumbo atrioventricular ngoko akukho ngumqobo gqithi. Oku kubangela wave ukubetha ekhangela ngendlela nizondelele ukuba eli candelo ebalulekileyo, apho kukho usasazo efanayo kulo unit intliziyo.

inkqubo Uhanjiso wentliziyo nayo iqulethe kubume balo inyanda block yesebe, ndibopha uYesti atrial kunye ventricular myocardium, kunye Purkinje, nto leyo yenze leesynapse kwiiseli kardiomiotsitarnyh uze unike neza eyimfuneko imisipha nemincili luvo. Enkabeni yalo, idatha ifayibha ke block eyayizalwa bundle isebe yokugqibela, eqhotyoshelwe kule plexus subendocardial ke ventricles zentliziyo.