Automaticity o ke kanaka naau: no ka ho'ākāka 'ana, ano,' iniha, kapuaʻi, aʻano piʻina

Cardiac automaticity ho rhythmic contraction kino ma lalo o ka hana o ka lāʻau ikiʻai wale 'ia malaila me ka manaʻo stimuli mai waho. Automaticity ka hoʻomaopop 'ana i loko o ke kino a pau a me kekahi mau wahi, akā,ʻaʻole i ka naau Muscle. Aia ka hōʻike o kēia kŰia - ka rhythmic kino o nā holoholona a me nā kānakaʻoki, kaʻawale mai na mea a pau, a i waho o ke kino.

O Keaukaha mua mea kōmi

Ma ka hoʻoholo 'ka mea i manaoia ma ka automata o ka naʻau, ka mea i loaʻa i nā aʻalolo impulses hiki e ua loaʻa i loko o atypical myocardial keena. Inā kekahi kanaka mea ola, i kēia kaʻina ia lŘlŘ kokoke i ka sinoatrial wahi ma muli o ka oko ao ma ka halepaahao ka waiwai a me ka 'ole o nā mall eiiiiiaiou. Ka mea, e hooponopono ma ka pūʻulu, i ke kinona o ka kālī, a me ka mea, ua hoopuniia e basal lamina. I ka lua o ka inoa o kēia mau keena - na O Keaukaha o ka mua o ka papa i kela (pacemakers). e loaa hou mai keʻano o ka hanaʻana i hoʻomaka ai i loko o ia ma ke kiʻekiʻe wikiwiki, a no keia mea, metabolites noho i loko o ka interstitial loli, me ka loaa ana i ke kau.

Eia hou, nā 'ano o nā kēia:

• He oiaio, ua kiʻekiʻe permeability e kalipuna a me ka paʻakai Ion.
• A uuku waiwai o kaʻili lahilahi Loaʻaʻia.

Aie i ka mea likeʻole i loko o ka lehulehu o ka paʻakai, a potasiuma i hōʻike iki haʻawina functioning paʻakai-potasiuma EII ni.

Automaticity o ka naau

Muli o kona kulana he lōʻihi manawa i ole naau automaticity hiki i ka hopena hoʻokolokolo, hoʻowahāwahā i ka mahuahua pono o ke kula i loko o kēia kaʻina. Na Huaolelo ligatures Stannius - ike kalapona ho okolohua lawe mai ma luna o ka kumu o ka wehe 'ana i kekahi māhele o ka rana naau uhi dressings. Nā hualoaʻa hōʻike ana i ke kino ka makana 2 automaticity oaio ma ka liʻiliʻi loa.

Kekahi o ia o Nyos i loko o ka venous sinus, kōkua ai i nā aligning hua h ÷ ailona lua - mea ma ka hapa waena o ka ventricle a me atria (ka mea, ua i kapaia hunaia). Kana hana hoʻomaka wale nō ma hope o eliminated 1 waena. Ke Muscle o ka naau, i mea loihi, mai na ioauoa o nā hana - hoemi - ma luna o lākou iho. Pela, ke automaton o ke kanaka naʻau ua pili i impulses emanating mai kēia mau-oaio? A.

hoʻomanaʻo Landergorfa

I mea e hōʻemi ai ana mawaho mai o ka naau o ke kino, he iaoia Landergorfa. Ke ano mea like penei:

1. oki mai Heart, a hookomo i ka cannula i loko o ka aorta, a ua pili i ka moku o ke aniani.
2. Ua piha ka moku me Ringer ka pāʻoihana a me ka monakō koko, a hiki e hou defibrinated koko.
3. Ke kākoʻo pāʻoihana Ua paʻa kūhohonu loa me ka o oxygen, a enaena i ka kekahi wela (ma kahi o 48 kekelē Kelekia ma).
4. Loli hoʻomaka e kahe ana ma lalo o puʻe i loko o ka aorta kiwikā hoopau iho nei, a ua kauoha ia wai i loko o ka coronary artery, i ka hana o ka a - i ka mana o ka hui, holoʻokoʻa.

Ma lalo o ia mau rula, o ka holoholona ka kino, a me ke kanaka mea hiki ke hana no ka lōʻihi manawa, keia mea i ka automaticity o ka naau. E ho ohana i keia hana, e hiki hoʻi i ka lāʻau ikiʻai wale o ka naau, a i papani ai hoi i kekahi mau hola aku nei ia. I ke kakahiaka nui 20th kenekulia no ka manawa mua ia huli mai, e hoʻomaha i ke kino o kekahi keiki opiopio, a me ka wale hope loaa hana o ka naau, i ua ole hoʻohanaʻaneʻane 48 hola. I ka halaʻana o ka pāʻoihana ma na ipu naau i malamaia no ma kahi o 15 hola.

Description akomi Hihia '

automaticity o ke kanaka naau hoʻomaka me ka diastole pae ana o kona hoike ana - o ka paʻakai i loko o ka halepaahao neʻeʻana. ʻili lahilahi Loaʻaʻia , ke'ōlelo mai nui hoemi, e mālama ai i ka waiwai o ka palena iki kiʻekiʻe o ka depolarization. Hoemiia ka uku o kaʻili lahilahi, a me ka helu kuhi puke he kali hoʻi koʻu depolarization o diastole. Open kaha no ka kalipuna a me ka paʻakai i loko o ka hoʻokēʻai waikahe e depolarization pae, Ion hoʻomaka 'Imi kuhikuhi i ka halepaahao. No ka mea, o keia kauoha, mua ho opa ao emi a me ka hikiʻole, a laila, i ke ku pono ana i ua auou caiaiai. Paʻakai höʻike mai a equilibrium ua hiki aku ma kona Ion (electrochemical).

Aia hele mai ka plateau pae. Aia mau ana o ke kalipuna. naau'aʻaʻa koe nonexcitability ma keia wahi. I a hiki i equilibrium pili Ion pae welau a me repolarization i, a 'o ia hoʻi i kaʻili lahilahi kauoha hoʻi a hiki i ka mua kiʻekiʻe.

Aka wahi naau automaticity

A kūikawā wahi i loko o ka luna 'kaʻina hoopiha kahua o ka naau automaticity. ka mua kauoha ua kapaia ka sinoatrial wahi. Kēia O Keaukaha He He mua-mea ana, a hōʻoiaʻiʻo i ka maʻamau naau kōmi. Waiho kokoke ka confluence o ka oi vena cava. Kona 'ole - he uuku helu o ka naau Muscle olona, a me neural a hāʻule pahū wale. lua o ka papa wahi i kapaʻia ka atrioventricular wahi. Kēia mea he huna Keaukaha o ka lua-mea kōmi. Ua loaʻa i ke kolu o ka-mea wahi keena ventricular conduction nenoaiu.

All O Keaukaha kākoʻo i ka lalo loa uku ana i kela mana, ina he mea he piha naʻau hihia. Ke alapine (frequency) o ka ventricular ana e holo mai ana i ka palena iki 'ilikai, a me nā mea maʻi e kanu pū pacemaker uila type, a laila iʻimi hoʻopunipuni pacemaker.

Ka muli o Loaʻaʻia

sinoatrial wahi Loaʻaʻia kekahi mau maiʻike mau ikaika hawewe ma - 50 MV. Ma ka maʻamau moku'āina Loaʻaʻia ikea mai ma ka'āina ma muli o ia i ke alo o ke keena i mea na Keaukaha o ka mua-mea kōmi. Ke koe māhele o ka naau ma lalo o kekahi no keia hoi paha nā aʻalolo impulses ka wā o ka hou stimulus, e like me ka hoohuli ana aku i ka mua o ka papa. Ke'ōlelo mai, no ka hanauna o ka lāʻau ikiʻai wale i loko o ka lua o ka papa wahi (alapine (frequency) ma kahi o 60 mau manawa / min). Ma stimulation i wahi keena pua o kona mau pīhoihoi, i ke alapine (frequency) emi i ka 30 (O Keaukaha kolu o ka-mea kōmi).

I ka hanaʻia o nā pacemakers mea pololei hapaʻauhau i ka mea kiʻekiʻeʻili lahilahi permeability e kalipuna a me ka paʻakai Ion, a ua emi i ka permeability o potasiuma Ion.

ʻano piʻina automaticity

Automaticity o ka naau ma lalo o maʻamau olelo a pau wahi a pau o ka'ōnaehana ua uhi pū sinoarterialnym wahi "hoʻokō i" kona iho pāpana. No keia kumu, a pau eiiiiiaiou o ka'ōnaehana a me kona mau pāpana kukulu i ka hana i loko o ka hookahi uuku ae. ʻano piʻina cardiac automaticity - he kŰia i ho'ēmi i kā ke hiki i ka automaticity like me ka mamao mai ka wahi generalization ka lāʻau ikiʻai, a laila i ka'āina o ka mua o ka papa.

He nōʻikeʻole i ke kumu o ka abrupt loli i loko o kaʻoihana o ka halepaahao, ia lŘlŘ spontaneously. Automaticity o ka naau i e pili ana i ka maʻiʻo o acetylcholine i loko o nā O Keaukaha o pāpana. He nui nā kānakaʻepekema manaʻo i ka kŰia mea ku pono i ke 'o pūnao ma na keena o ka Keaukaha, a hiki hoʻololi i ka moku'āina o kaʻili kai membranes.