Cardiac conduction'ōnaehana: 'ole, hana a me ka anatomical a me ka physiological hiʻona

An nui ano o ka hana ana o ka naau Muscle mea automatism ho'ēmi. Ua pono papa hoʻolaukahi hana o ka naau, i ka nānā 'ana ma luna o sequential contraction a me ka hoʻomaha o ka Muscle'aʻaʻa o ka atria a me ventricles, e mālama nei i nā aʻalolo impulses hooponopono ma ke kelepona hele' ole me ka huikau 'ole.

A lawelawe nenoaiu o ka naau - he nuiʻano papa hana e hōʻoia 'functioning o ke kanaka meaola, oia hoi o ka lāʻau ikiʻai wale mīkini hana wāwahie (pacemaker) a me kanaka luna' me ka ho okumu i manao ia no ka innervation infarction pōʻaiapuni. Oia no ka ke kelepona hele 'ole, a ua nānā' ana i ka hana P-aeee a me T-keena, ka mea, ua manao ana e hoʻomaka ai, a i kahi kūlike i ka naau contraction o ka naʻau keʻena. Ka muaʻano o ke keena, ua nui physiological oihana o ka automaton - ka 'auhau no rhythmic contractions me kekahi hookahua pilina me ka ole o kekahi mawaho stimuli.

T keena, ma ka huli, i ka contractile impulse EYI nona iho ua loaʻa P-aeee i ka myocardium, i hōʻoiaʻiʻo pilikia-noa hana. Ke'ī mai, i ka hoʻokō 'ia' nenoaiu o ka naau, a ua muli ma ka physiology o ka pahee AaOIeIOUIeXAOAaIN o kēia mau pūʻulu o aeee, mea he hookahi liluweloʻano papa hana ua structurally hui pū i loko o ka cardiac mokuna.

E mālama nei i kanaka cardiac'ōnaehana ninoieo o kekahi mau ooieoeiiaeuiuo eiiiiiaiou: ka sinoatrial wahi, a me ka atrioventricular a me ka laulau lala hihia ma ka akau a me ka hema wāwae, pau i loko o Purkinje olona. Sinoatrial (sinus)'āina aia ma ke atrium akau, mea he uuku nui o ka Muscle olona, elliptical shape. Ia mea i loko o kēia ke keʻena, a hoʻomaka me ka hoʻokō 'ia''ōnaehana o ka naau, i ua loaʻa nā aʻalolo impulses, ma o na la contractile pane me koʻu naau a pau. Automata maʻamau sinoatrial wahi ua manaoia e ia mai he kanalima i kanawalu lāʻau ikiʻai wale no minuke.

Atrioventricular ke keʻena aia ma lalo o ka endocardium i loko o ka posterior Hoʻohana o ka interatrial septum, nui ka hana o ke kali, kānana a me redistribution o e hoʻopā ai ka lāʻau ikiʻai wale ua loaʻa, a hoouna aku la i ka sinoatrial wahi. Cardiac conduction'ōnaehana i hanaʻia hoʻokonukonu a distributive oihana i haawi ia ia i ka mall ke keʻena - ka atrioventricular wahi.

Ka nele no ia i ka hana ku i ka mea i ka nalu o ke aʻalolo impulses, e loaa ia pālahalaha ma ka atria'ōnaehana, a ma o na la i ko lakou muli o contractile pane koke komo i loko o ka ventricles o ka naau mea i hiki ia, no ka mea, ka mea atrial myocardium o na ventricles kaawale mai ka fibrous'aʻaʻa, maiʻaʻole hoʻi e hala ke aʻalolo impulses. A wale nō i loko o ka'āina o ka atrioventricular'āina no laila,ʻaʻole nō he insurmountable ke'ākeʻakeʻa mai. Keia ke kumu o ka lāʻau ikiʻai wale nalu ma ka huli ana i ke ala e piʻi ai i keia nui ke keʻena, ma laila o kā lākouʻaʻahu o ka makana ma ka cardiac pa alima.

Cardiac conduction'ōnaehana i kekahi i loko o kona 'ole o ka puapua lala aeie, paa atrial a me ka ventricular myocardium, a me Purkinje olona, a kuahene synapses ma kardiomiotsitarnyh keena, a hoomakaukau i na mea e pono interfacing o Muscle contraction a me ko mākou hopohopo pīhoihoi. Ma kona Kora naʻEsau, i ka puluniuʻikepili i ka hope loa ai manamana ai laulau lala aeie, pili i ka subendocardial plexus o na ventricles o ka naau.