Pūnaha cardiac āriponga: hanganga, mahi me ngā āhuatanga kikokiko, me te whaiaroaro

He āhuatanga nui o te mahi o te uaua ngakau ko ngä automatism. Pai tuituia mahi o te ngakau, e hāngai ana nei i runga i hukihuki raupapa me te whakangā o te kiko uaua o te atria me ventricles, whakahaere ponana karere whakaritea e te hanganga pūtau ki te hanganga uaua.

He pūnaha conductive o te ngakau - he tikanga faufaa ki te whakarite mahi o te rauropi tangata, arā, o te generator he pini (pacemaker) me ngā matatini takitahi tikanga mō huringa innervation infarction. Arā, o te hanganga pūtau, e hāngai ana nei i runga i te mahi P-pūtau me T-pūtau, Ko te tikanga reira ki te kōkiri me te ruruku i te hukihuki ngakau o ruma ngakau. He mahi whaiaroaro nui o te automaton te momo tuatahi o ngā pūtau - te kaha mo contractions naki, kahore tetahi hononga faaite ki te mana o tetahi whakaohooho waho.

T pūtau, i roto i te tahuri, i hangaia he kaha tuku contractile hihiko P-pūtau ki te myocardium, e whakarite raruraru-free mahi. Ko te kupu, ko te pūnaha tataki o te ngakau, e hāngai ana nei i runga i te whaiaroaro o te pāhekoheko maeneene o enei rōpū e rua o ngā pūtau, ko te tikanga koiora kotahi te hanganga ngā i roto i te kōwae cardiac.

ngā whakahaere pūnaha cardiac tangata o te maha wāhanga mahi: te kōpuku sinoatrial me te atrioventricular me poraka peka takai i matau, me te maui nga waewae, mutu i roto i muka Purkinje. Sinoatrial (pakohu) kōpuku kei roto i te marae tika, ko te papatipu iti o weu uaua āhua porotītaha. Ko roto i tenei wae, e haamata ki te pūnaha tataki o te ngakau, kua hangaia ponana karere, meinga whakautu contractile ki toku ngakau katoa. whakaaro Automata kōpuku noa sinoatrial te ki kia i rima tekau ki te waru tekau ngātere ia meneti.

wāhanga Atrioventricular kei raro te endocardium i roto i te wāhanga posterior o te pakitara wehewehe interatrial, he mahi nui o te roa, te tātari, me te tohatoha anō o ngātere hou hangaia, ka tonoa ki te kōpuku sinoatrial. mahi hoki pūnaha āriponga cardiac mahi ture, me te tohatoha whakaritea ki reira te wāhanga hanganga - te kōpuku atrioventricular.

E kore e taea te hiahia mo te mahi taua e tika ana ki te meka i te poipoi o ponana karere, tonu horahanga i roto i te pūnaha atria me meinga ratou whakautu contractile whakautu tomo tonu ki te ventricles o te ngakau ki, no te mea te myocardium Atrial o nga ventricles wehea i te kiko kaiota, e kore e mahue i nga ponana io. Na anake i roto i te rohe o te kōpuku atrioventricular na reira he kore, hauwarea. ai tenei te ngaru pini i roto i te rapu o te ara ki te titau ki tenei wae nui, te wahi i reira he ratou tohatoha ōrite puta noa i te wae cardiac.

Kei pūnaha āriponga cardiac hoki i roto i tona hanganga, he poraka peka paihere, here Atrial me ventricular myocardium, ko Purkinje muka, e hanga i synapses i runga i ngā pūtau kardiomiotsitarnyh me te whakarato i te pāhekotanga tika o te uaua hukihuki, me te oaoa io. I tona matua, nga raraunga muka ko te poraka manga Pekanga paihere whakamutunga, piri ki te plexus subendocardial o nga ventricles o te ngakau.