Gbasara obi muscle - anatomical na n'ahụ atụmatụ

The obi muscle enye mkpa ọrụ nke niile anụ ahụ, na mkpụrụ ndụ na akụkụ. Transport nke bekee na ahụ a rụrụ site na mgbe nile ọbara mgbasa; Ọ na-enye ma na-enwe homeostasis.

Ọdịdị nke obi muscle

The obi na-anọchi anya abụọ halves - ekpe ma nri, onye ọ bụla nke nke bụ ihe atria na ventricles. Ekpe ọkara nke obi nfuli na ọbara ọbara, na nri - venous. Ya mere, obi muscle nke ekpe ọkara bụ ọtụtụ thicker karịa nri. Uru nke atria na ventricles na-iche site fibrous yiri mgbaaka nke nwere atrioventricular valves: abụọ-mpịachi (ekpe ọkara nke obi) na tricuspid (nri ọkara nke obi). Ndị a valves n'oge gbasara obi mkpi gbochie nloghachi nke ọbara na atria. Na ụzọ ọpụpụ nke aorta na akpa ume akwara na-enịm fortnightly valves, nke gbochie nloghachi nke ọbara na ventricles n'oge diastole ngụkọta obi.

Gbasara obi muscle bụ nke striated muscle anụ ahụ. Ya mere, nke a muscle nwere otu Njirimara dị ka nke skeletal muscle. Akwara eriri mejupụtara myofibrillar na sarcoplasmic sarcolemma.

N'ihi obi napụta ọbara site na ọbara arịa. The rhythmic mkpi nke uru ahụ nke atria na ventricles (systole) alternates na ya ntụrụndụ (diastole). Zipụta ha n'usoro mgbanwe nke systole na diastole nke okirikiri nke obi. The obi muscle na-arụ ọrụ rhythmically, na-enweta site usoro, na-eduzi n'ahụhụ n'akụkụ dị iche iche nke obi

The n'ahụ Njirimara nke obi muscle

The excitability nke myocardium - bụ ya ike na-eme eme na eletriki, n'ibu, kwes na chemical stimuli. The excitation na mkpi nke obi muscle na-adị mgbe ihe mkpali esịmde a fọrọ ike. Obere iyatesịt fọrọ adịghị irè ma na-adịghị agbanwe suprathreshold ike nke myocardial mkpi.

Excitation nke muscle anụ ahụ nke obi so site ọdịdị nke ihe nwere. Ọ shortened na lengthened na a quickening obi ọnụego deceleration.

Obi tọrọ ya ụtọ na obi muscle nkenke tụfuru ya ike na ime ọzọ stimuli ma ọ bụ gboo na-abịa site na isi iyi nke automaticity. Nke a na-akpọ refractory-abụghị excitable. Strong stimuli na-eme ihe na muscle na a oge nke ikwu refractoriness ime ka ihe pụrụ iche mkpi nke obi - na-akpọ akaghi gafere.

Myocardial nwere atụmatụ tụnyere na skeletal muscle anụ ahụ. The excitation na mkpi na gbasara obi muscle adịru ogologo karịa skeletal. Na gbasara obi muscle aerobic Filiks merie resynthesis ọgaranya ogige. N'oge diastole, e nwere akpaka mgbanwe nke na akpụkpọ ahụ nwere ọtụtụ mkpụrụ ndụ dị iche iche nke saịtị. N'ihi ya, obi ụtọ na-agbasa uru nke atria na esịmde atrioventricular ọnụ, nke a na-ewere na etiti nke automaticity II iji. Ọ bụrụ na anya sinoatrial ọnụ (ligated, jụrụ, nsị), mgbe ahụ, mgbe a mgbe ventricles amalite kpum ọzọ obere n'afọ iri na ụma n'okpuru nduzi nke gboo ịda na atrioventricular ọnụ.

Conduction nke excitation n'akụkụ dị iche iche ndị na-ahaghị obi. Anyị ga-asị na ọkụ-blooded ụmụ anụmanụ ọnụego excitation nke atrial muscle esiwọrọ bụ banyere 1.0 m / s; a conductive ventricular usoro 4.2 m / s; na ventricular myocardium ka 0,9 m / s.

A mara mma nke excitation nke obi muscle bụ na ihe nwere mere na onye na òkè nke muscle anụ ahụ, na-agbasa ndị ọzọ na saịtị.