Cardiac conduction hurongwa: mamiriro nerevane anatomical uye vasiri zvinhu

An chinokosha chakanangana basa kwomwoyo tsandanyama ndiyo automatism reductions. Well chikwata basa mwoyo, iyo yakavakirwa sequential marwadzo uye kutandara pakati ari tsandanyama rinenge riri atria uye ventricles, kuitisa tsinga nomunhu nokudzorwa munhu cellular chivako ane zvakaoma kunzwisisa.

A conductive maitiro mwoyo - chinokosha mashandiro kuitira kushanda kunoita muviri, ina kupomba jenareta (pacemaker) uye idzodzo nomumwe kunzwisisa aiendeswa innervation infarction zvinogara. Ina cellular mamiriro, iyo yakavakirwa basa P-masero uye T-masero, Mwari akaronga kuti kutanga uye dzinotarisira mwoyo marwadzo mwoyo makamuri. The mhando masero yokutanga ine zvinokosha vasiri mashandiro ari automaton - tichikwanisa mutinhimira sunga asina achitaura chokuita simba chero zviwane.

T masero, akavapindurawo, vane contractile zvairatidza yedzimudzangara vanokwanisa wakadenha P-masero kuti myocardium, izvo zvinoita dambudziko-isina kushanda. Saka, achitungamirira gadziriro mwoyo, iyo inobva physiology ari anotsvedzerera kusakarongeka mapoka aya maviri masero, ndiwo chete utachiona mashandiro ari zvayakaita zvaisanganisira mune cardiac chikwata.

Kuitisa hwevanhu cardiac hurongwa chinosanganisira anoverengeka dzichipfekeka zvinoriumba: asi sinoatrial raiva pedyo nebundu uye atrioventricular uye chiputu bazi nechigumbuso kurudyi nokuruboshwe makumbo, vachipedzisira Purkinje fibers. Sinoatrial (sinus) raiva pedyo nebundu iri mugwara atrium, ari murwi duku tsandanyama fibers elliptical chimiro. Iri chikamu ichi, unotanga achitungamirira gadziriro mwoyo, kunotangira tsinga nomunhu, zvichikonzera contractile mhinduro nomwoyo wangu wose. Automata Muzvarirwo sinoatrial raiva pedyo nebundu iri kuonekwa kubvira mashanu masere pulses paminiti.

Atrioventricular zvinoriumba yaiva pasi endocardium iri posterior chidimbu kubva interatrial septum, chinokosha kushanda kunonoka, mupise uye redistribution kuti kuuya pulses vanowanika uye akatumirwa sinoatrial raiva pedyo nebundu. Cardiac conduction hurongwa zvakare anoita pamutemo uye distributive mabasa basa nazvo STRUCTURAL pakuderedza - the atrioventricular raiva pedyo nebundu.

The kudikanwa basa rakadaro nokuti kuti wave tsinga nomunhu, pakarepo kupararira kuburikidza atria maitiro uye kukonzera kwavo mhinduro contractile mhinduro pakarepo kupinda munzvimbo ventricles nomwoyo yausingagoni, nokuti atrial myocardium pakati ventricles aparadzana fibrous zvinyama, musapotse etsinga nomunhu. Uye chete munzvimbo yacho atrioventricular raiva pedyo nebundu saka hapana sezvisingakundiki nokuidzivirira. Izvi zvinokonzera kuti kupomba chinozunguzirwa vachitsvaka nzira kuvimbisa kuti chikamu ichi chinokosha, apo pane dzavo dzakafanana akaparadzirwa cardiac chikwata.

Cardiac conduction hurongwa rinewo wayo maumbirwo rimwe svinga bazi nechigumbuso, ndichisunga atrial uye ventricular myocardium, uye Purkinje fibers, izvo zvinoumba synapses pamusoro kardiomiotsitarnyh masero uye kupa anodiwa interfacing kuti tsandanyama marwadzo uye huta mafaro. At paro, dziri faibha Data ndivo yokupedzisira chinogumbura branching tsapo webazi, vasiyana subendocardial plexus pakati ventricles zvomwoyo.