Automaticity daga cikin zuciyar mutum: da definition, description, raka'a da dan tudu

Cardiac automaticity wakiltar rhythmic ƙanƙancewa jiki a karkashin mataki na hatsaisai faruwa a cikinta ba tare da feedback samuwar kasashe daga waje. Automaticity ne muhimmi a cikin dukan jiki da kuma wasu sassa, amma ba da zuciya tsoka. Akwai shaida da wannan sabon abu - da rhythmic jikin dabbobi da mutane cuts, ya zama ruwan dare daga kome, kuma ya sanya waje na jiki.

Drivers farko domin rate

A kayyade abin da ake nufi da automata na zuciya, an gano cewa jijiyar za a iya generated a atypical tsokar Kwayoyin. Idan wani mutum ne da lafiya, wannan tsari ya auku a kusa da sinoatrial kumburi saboda bambance-bambance a cell dũkiyarsu da kuma tsarin da sauran tsarin aka gyara. Suna shirya a kungiyoyin, da siffar wani dogara sanda, kuma sũ, an kẽwaye da muhimmi lamina. Na biyu sunan wadannan Kwayoyin - direbobi na farko domin rate (auna bugun zuciya). musayar matakai faruwa ne a gare su a wani babban gudun, kuma domin wannan dalilin metabolites kasance a cikin interstitial ruwa, ba tare da ciwon da za a hõre.

Bugu da kari, cikin halaye na da wadannan:

• Ã'a high permeability zuwa alli da sodium ions.
• A kananan darajar da membrane m.

Saboda bambanci a cikin taro na sodium da kuma potassium nuna kadan aiki aiki sodium-potassium famfo.

Automaticity na zuciya

Quite lokaci mai tsawo ya ba zuciya automaticity zuwa karshen bincika, duk da ya karu sha'awa na malamai a wannan tsari. Hanyar ligatures Stannius - da aka sani da sake zagayowar gwaje-gwajen da za'ayi a kan tushen da kau da wasu sassa na rana zuciya mai rufi dressings. A sakamakon ya nuna cewa jiki ne ba 2 automaticity cibiyar akalla.

Daya daga cikin su an located in venous sinus, facilitates aligning abbreviations biyu - shi ne a bangare tsakanin ventricle da atria (shi ne kuma ya kira boye). Aikinsa ya fara ne kawai bayan shafe 1 cibiyar. A tsoka daga cikin zuciya, wanda shi ne m daga cikin cibiyoyin biyu ayyukansu - rage - a kan nasu. Saboda haka, automaton daga cikin zuciyar mutum da ake dangantawa da hasken dake fitowa emanating daga wadannan cibiyoyi.

hanya Landergorfa

Domin rage fassara waje na zuciya na jiki, wani Hanyar Landergorfa. The ma'anar ne kamar haka:

1. Zuciya yanke batyri kuma shigar da cannula cikin lakã, wanda aka haɗa zuwa wani jirgin ruwa na gilashi.
2. A jirgin ruwa da aka cika da Ringer ta bayani tare da glucose, ko za a iya kara defibrinated jini.
3. A bayani da aka tare da cikakken oxygen da kuma mai tsanani ga wani zazzabi (game da 48 digiri Celsius).
4. Bewafa fara gudãna daga ƙarƙashin matsa lamba a cikin lakã bawul ya rufe da ruwa ne directed a cikin jijiyoyin zuciya jijiya, da aiki da abin da - da ikon dukan zuciya da sauransu.

A karkashin irin wannan yanayi, dabba ta jiki, ko mutumin da yake iya yi aiki na dogon lokaci, wannan ne automaticity na zuciya. Amfani da wannan hanya, za ka iya komawa cikin hatsaisai na zuciya, wanda ya riga ya tsaya a 'yan hours ago. A farkon karni na 20th a karon farko ya juya daga rayar da jikin mai yaron, da kuma kawai daga baya gano aiki da zuciya, wanda aka ba sarrafa kusan 48 hours. Bayan wucewa da bayani ta hanyar da zuciya tasoshin da aka kiyaye game da 15 hours.

Description Atomatik Tsari

automaticity daga cikin zuciyar mutum ta fara da diastole lokaci na ta bayyana - na sodium a cikin cell motsi. Matattarar yuwuwar haka ƙwarai rage, shi o ƙarin tabbatar da darajar da m matakin na depolarization. Rage lura da membrane, da kuma fara wani jinkirin depolarization na diastole. Open tashoshi ga alli da sodium a cikin azumi qoramu depolarization lokaci, ions fara rayayye directed zuwa cell. Saboda wannan cajin, da farko abruptly rage-rage, kuma ya kai sifili, sa'an nan kishiyar aka maye gurbinsu. Sodium motsa har sai ma'auni ne kai ta ions (electrochemical).

Akwai zo a Filato lokaci. Akwai ci gaba da motsi na alli. zuciya tsoka da ya rage nonexcitability a wannan lokaci. Bayan kai ma'auni dacewa ions lokaci iyakar kuma repolarization ya auku, wanda ke nufin da membrane cajin koma asali matakin.

Nodes zuciya automaticity

A wuri na musamman a cikin hadaddun aiwatar zauna shafukan da zuciya automaticity. na farko domin da ake kira sinoatrial kumburi. Wannan direban ne a farko-domin kudi, wadda tabbatar da al'ada zuciya rate. Ayi kusa da mahaɗar tsakãninsu da m vena cava. Its tsarin - karamin yawan zuciya tsoka zaruruwa da na tsarin jijiya endings. biyu domin kumburi kira da atrioventricular kumburi. Wannan shi ne a boye direba na biyu-domin kudi. Yana dauke da uku-domin kumburi Kwayoyin na ramin zuciya madugu tsarin.

Duk da direbobi tallafawa ƙananan domin kudi kudi kudi dalĩli, idan akwai cikakken zuciya block. A mita na na ramin zuciya rate na gabatowa m matakin, da kuma marasa lafiya da aka gina na'urar bugun zuciya lantarki type, Ina nufin wani wucin gadi na'urar bugun zuciya.

Ana zargin m

sinoatrial kumburi m daban-daban daga al'ada mawadãta a - 50 MV. A al'ada jihar iko bayyana a kumburi saboda gaban na sel da suke da direbobi na farko-domin kudi. A sauran sassa na zuciya a karkashin wani yanayi ma samar da jijiyar lokacin da ƙarin kara kuzari, kazalika da juya kashe farko domin. Saboda haka, ƙarni na hatsaisai a karo na biyu domin kumburi (mita game da 60 sau / min). A lokacin ruri a kumburi Kwayoyin cuta daga ne m, da mita rage-rage zuwa 30 (direbobi uku-domin rate).

A mataki m dukkan auna bugun zuciya ne kai tsaye na gwargwado ga high membrane permeability zuwa alli da sodium ions, da kuma rage permeability na potassium ions.

dan tudu automaticity

Automaticity na zuciya a karkashin al'ada yanayi dukan sassa na tsarin da aka suppressed sinoarterialnym kumburi "kallafa" da kansa kari. Saboda wannan dalili, duk kayan da tsarin tare da kansa kari sāke gina aiki a cikin wannan taki. Dan tudu cardiac automaticity - wani sabon abu wanda rage ikon automaticity matsayin nesa daga wurin hakan hatsaisai, Ina nufin kumburi na farko domin.

Shi ne har yanzu ba a sani ba abin da ya haddasa ba zato canji a lura da cell, na faruwa ne kwatsam. Automaticity na zuciya iya alaka da abun ciki na acetylcholine a cikin direbobi da kari. Masana kimiyya da dama imani da cewa sabon abu ne saboda da peculiarities na metabolism a cikin sel da direba, wanda zai iya canza jihar na surface membranes.