InotungamirwaSainzi

Cardiac kutenderera. Maitikiro of cardiac kutenderera

Cardiac tsandanyama anoita zvinokosha mabasa kuti muviri, kufara kukwanisa kuita kugadzikana uye kuderera.

Kufara ndiwo emavambo zvose masero myocardial. Asi bvunzai reductions muviri mutinhimira aiva sinus raiva pedyo nebundu masero, saka rekukwazisa vava kukwanisa kuvhundutswa nokutaura hombe kanoverengeka paminiti pane vamwe. It zvinowanzoitika 60-80 kanomwe wakadzikama ezvinhu.

Electrochemical aiita pakati masero rinopa excitation conductance: kupararira yose myocardium. With electrocardiograph izvi zvinogona kubata uye kuongorora basa tsandanyama.

A mano pamwoyo wakaderedzwa rinoitwa, sezvo chikazozikamwa, kutenderera rine zvikamu zvakawanda. Inodzora dzayo basa tsinga. The cardiac kutenderera danho uye kuti diastole uye systole mwoyo.

Cardiac kutenderera rinotanga pashure excitation ari sinus raiva pedyo nebundu. Panguva ino, atrium uye ventricles vakasununguka uye azere neropa. Kana chiratidzo achatorwa, ivo atria vari kutanga kusviba. Somugumisiro, mashoko ventricles ndivo ropa uye dzimwe achibatsira, zvakare kufara. Panguva imwe chete chinoshanda wokutanga chinozunguzirwa - danho asynchronous rutapudzo. The kumanikidzwa ari ventricles anova kufurirwa kwakasimba muna atria, uye pakarepo namahwindo bapiro mavharuvhu. With ichi cardiac kutenderera wechipiri anopinda chehupenyu Isometric marwadzo. Panguva iyi, Vhoriyamu ventricles haachinji, uye kumanikidzwa mavari richikura. Kana zvava kupfuura zvinobva nhumbi mwoyo, semilunar mavharuvhu akazaruka miromo uye Isometric marwadzo danho. Pashure paizvozvo, ropa mwoyo kusingachakosheswi mudziyo. Isometric uye asynchronous maitikiro ose cardiac kutenderera ndiye systole mwoyo.
Uyezve, mwoyo uri dzakadekara ezvinhu. Cardiac kutenderera anopinda Pasika Isometric kuzvivaraidza. By okupedzisira ose semilunar mavharuvhu uye mberi kutandara pamusoro nhengo kunyange apo vose mavharuvhu dzakavharika kunokonzera kumanikidzwa nenhumbi. Panguva ino ari atria inowanikwa zvishoma nezvishoma ropa. Mangoti ayo kumanikidzwa kunova kupfuura kumanikidzwa vari ventricles, akazaruka kurova-rova mavharuvhu uye ventricles azere neropa. Ipapo denderedzwa anotanga chinotevera cardiac kutenderera. Uye nguva ventricular zvekupfakira uye atrial marwadzo, uye chehupenyu Isometric kutandara pamwe chete kuti diastole mwoyo.

Panguva midziyo ropa iri ejection migove pave kumanikidzwa isingadariki 120 mm HG. Art. Mumidziyo huru, hazvina haachinji. Panguva kugumiswa muropa ravo kubva pamwoyo, rikawira, asi kwete asingasviki 80 mm HG. Art. Mukati miniti imwe, pane kutenderera wakakwana zvishanu kana zvitanhatu litres ropa, iro zvinowanikwa akura utano munhu. Kana vamwe muviri vachada zvinopfuura ropa aibuda, tanga ikure lumen pakati arterioles, capillaries, uye vazhinji vachange chete pakupedzisira kuwedzera negoho mwoyo pachayo. Zvichaita rokumusoro, riri hombe bhuku ropa vabudiswa mune rimwe rutapudzo (vhoriyamu pa mwoyo urove) uye zvikuru muviri uchaderedzwa. Chitsama ropa kuti mwoyo runopfuura paminiti (cardiac goho) hakubvi chete pamusoro mamiriro mumuviri uye mupfungwa, asi pamusoro kukura uye muviri uremu. Naizvozvo, kuti vaongorore munhu basa mwoyo, vanotarisira anokosha cardiac indekisi.

Uyewo, mwoyo unogona kushandura kakawanda sunga uye simba ravo, nokukurumidza panguva iyo excitation rinoitwa pasi pokudzora nomunhu, vanotumwa kuti nechepakati tsinga. Somuenzaniso, kuti zviratidzo izvozvo kuderedza vagal simba, kakawanda kwavo kunova vashoma, kushungurudzika ipfupi uye kuitwa zvikuru zvishoma nezvishoma. Asi zvinodiwa akatumwa tsitsi tsinga, muri zvakanyatsosiyana.

Uyezve nzira ropa, vabudiswa mumwoyo kuburikidza arteries mberi.

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