Umjikelezo intliziyo. Izigaba zomjikelo intliziyo

umsipha wentliziyo owenza imisebenzi ebalulekileyo umzimba womntu, indlela yimincili ukukwazi ukwenza yokususa ukuhla.

Sijabulile ngenene zonke iiseli engabalulekanga. Kodwa zibuze unciphiso isingqi umzimba iiseli node sinus, ukwenzela nje ukuba babe nako ukuba sichulumancile linani elikhulu amaxesha ngomzuzu kunabanye. Lidla yenzeka 60-80 imozulu izolile.

ukwenzela Electrochemical phakathi kwiiseli inika conductance excitation: lithe laqhenqetha kulo myocardium. Nge electrocardiograph le nkqubo sifake nokuhlalutya umsebenzi izihlunu.

A amandla yehlise intliziyo lwenziwa, njengoko iyaziwa, kumjikelo equka izigaba ezininzi. Olawula umsebenzi wawo luvo. Isigaba Umjikelo ezesifuba nokwenza diastole kunye systole kwentliziyo.

Umjikelo wentliziyo iqala emva excitation kwi esiludumbo sinus. Ngeli xesha, intendelezo kunye ventricles bekhululekile kwaye kuzaliswa kunye negazi. Xa isignali sifunyenwe, imithambo sebeqala ukwehla. Ngenxa yoko, le ventricles ke igazi kunye usiza extra, yimincili kakhulu. Kwangaxeshanye kusebenza iliza yokuqala - kwisigaba ukuncitshiswa emgudu munye. Uxinzelelo kwi ventricles uba uxinzelelo ngamandla imithambo, kwaye nangoko ezivaliweyo kwemithambo etikweni. Nalo mjikelo yesibini kwentliziyo engena kwisiGaba of nokuncipha ulwandiso. Ngeli xesha, umthamo we ventricles ayitshintshi, kwaye uxinzelelo kuzo iyaqhubeka ngokukhula. Xa kuba ngaphezu koko ophuma iimpahla intliziyo, kwemithambo semilunar eziphelweni ezivulekileyo kunye nesigaba nokuncipha ulwandiso. Emva koko, lo igazi entliziyweni zityhalelwa kulo isitya. izigaba ulwandiso kunye olungenangqamaniso yomjikelo kwentliziyo ke systole kwentliziyo.
Ngaphezu koko, intliziyo sikwimo sikhululekile. Umjikelo wentliziyo engena kwisiGaba kuthanjiswa ulwandiso. Ngu ukuvalwa semigudu semilunar nokuphumla ngakumbi organ naxa zivaliwe zonke izivingco ibangela uxinzelelo kwi iimpahla. Ngeli xesha kwi imithambo ngokuthe ukugeleza igazi. Kamsinya nje zaphembelela kuba ngaphezu uxinzelelo kwi ventricles, iivelufa caba evulekileyo ventricles azele ligazi. Ke circle iqala umjikelo intliziyo olandelayo. Kwaye ixesha ventricular yokuzaliswa nokurhwaqela atrial, kwaye isigaba zokuphumla ulwandiso kunye kwenza diastole kwentliziyo.

Ngelo xesha imithambo yegazi ngokwezahlulo ejection kudala a xi elingagqithanga 120 mm HG. Art. Kwiinqanawa enkulu, ayithethi kutshintsha. Ngelo xesha ngokunqunyanyiswa egazini labo ngokusuka entliziyweni, uwe, kodwa hayi ngaphantsi kwe-80 mm HG. Art. Ngomzuzu omnye, kukho isekethi epheleleyo ezintlanu okanye ezintandathu iilitha igazi, ezi ke ziyafumaneka kwi omdala onempilo. Ukuba abanye umzimba kuya kufuneka ukuhamba kwegazi ngakumbi, qala ukwandisa sayo of arterioles, emithanjeni, yaye abaninzi baya kuhlala kuphela ukwandisa imveliso yentliziyo ngokwayo. Kuya kuba oluphezulu, ubukhulu umthamo wegazi betekisi ukwehla elinye (yabetha volume intliziyo ngalinye) kunye nomzimba kokukhona iya kuncitshiswa. Isixa igazi ukuba intliziyo bubalaselayo ngomzuzu (output kwentliziyo) kuxhomekeke kuphela ngobume ngokwasemzimbeni nangokweemvakalelo, kodwa ukukhula kunye nokutha emzimbeni. Ngoko ke, ukuze ukuvavanya umsebenzi ngamnye wentliziyo, ulindele isalathisi ekhethekileyo inhliziyo.

Kwakhona, intliziyo ungatshintsha nezihlandlo izishunqulelo namandla abo, isantya apho excitation lwenziwa phantsi kwempembelelo neemvakalelo, ezithunyelwa kwinkqubo luvo. Ngokomzekelo, imiyalezo do ukunciphisa vagal njengongenamandla, zabo rhoqo liba anqabe, ukuphazamiseka sinciphile kwaye lwaqhutywa kakhulu kancinci. Kodwa amaza ethunyelwe kwimithambo- onovelwano, kuba nje eyahlukileyo.

indlela igazi koko, betekisi ngokusuka entliziyweni ngenxa yegazi kuyaqhubeka.