Plawv conduction system: cov qauv, muaj nuj nqi thiab anatomical thiab physiological nta

Ib qho tseem ceeb cov yam ntxwv ntawm lub chaw ua hauj lwm ntawm cov kev mob plawv yog automatism txo. Zoo hauj lwm ua ke ua hauj lwm ntawm lub plawv, uas yog raws li nyob rau hauv zaj contraction thiab so ntawm lub nqaij ntawm lub atria thiab ventricles, kev paj impulses tswj los ntawm ib tug cellular qauv nrog ib tug tham qauv.

Ib tug conductive system ntawm lub plawv - ib qho tseem ceeb mechanism los xyuas kom meej hauj lwm ntawm tus tib neeg kab, muaj raws ntawm ib tug mem tes generator (pacemaker) thiab ib tug neeg txoj formations npaj rau innervation infarction mus. Hom ntawm ib tug cellular qauv, uas yog raws li nyob rau hauv chaw ua hauj lwm P-hlwb thiab T-hlwb, nws yuav los pib thiab tswj lub plawv contraction ntawm lub plawv lag. Tus thawj hom hlwb muaj ib qho tseem ceeb muaj sia functions ntawm lub Automaton - lub peev xwm rau zoo lus tsis muaj express kev twb kev txuas nrog tus ntawm tej sab nraud stimuli.

T hlwb, nyob rau hauv lem, muaj ib tug contractile impulse kis tau tus mob muaj peev xwm generated P-hlwb mus rau lub myocardium, uas saib kuas muaj teeb meem-dawb lub lag luam. Yog li, lub kev system ntawm lub plawv, uas yog raws li nyob rau hauv lub cev ua haujlwm licas du sis ntawm no ob pab pawg ntawm cov hlwb, yog ib tug hluas lom mechanism yog structurally muaj nyob rau hauv lub plawv chav tsev.

Ua tib neeg mob system muaj ob peb haumxeeb Cheebtsam: lub sinoatrial ntawm thiab lub atrioventricular thiab nras ceg thaiv nyob rau txoj cai thiab sab laug ob txhais ceg, xaus nyob rau hauv Purkinje fibers. Sinoatrial (qhov ntswg) ntawm nyob rau hauv txoj cai atrium, yog ib tug me me pawg ntawm cov nqaij fibers elliptical zoo. Nws yog nyob rau hauv no kev tivthaiv, uas pib nrog cov kev system ntawm lub plawv, yog generated paj impulses, ua contractile cov lus teb rau tag nrho kuv lub siab. Automata qub sinoatrial ntawm yog pom tias yuav tsum yog los ntawm tsib caug rau eighty pulses ib feeb.

Atrioventricular tivthaiv nyob rau hauv qab lub endocardium nyob rau hauv lub posterior ya ntawm lub interatrial septum, ib qho tseem ceeb muaj nuj nqi ntawm kev ncua, filtering thiab redistribution cov khoom pulses generated thiab xa mus rau lub sinoatrial ntawm. Plawv conduction system kuj ua ntxawg thiab distributive khiav dej num rau nws ib tug yam ntxwv feem - cov atrioventricular ntawm.

Qhov yuav tsum tau rau xws li ib tug muaj nuj nqi vim lub fact tias cov nthwv dej ntawm paj impulses, instantly kis los ntawm lub atria system thiab ua lawv teb contractile teb tam sim ntawd mus rau mus rau hauv lub ventricles ntawm lub plawv yog tsis muaj peev xwm, vim hais tias cov atrial myocardium ntawm lub ventricles sib cais los ntawm lub fibrous cov ntaub so ntswg, tsis nco lub paj impulses. Thiab xwb nyob rau hauv lub cheeb tsam ntawm lub atrioventricular ntawm thiaj li muaj yog tsis muaj insurmountable barrier. Qhov no ua rau cov mem tes yoj nyob rau hauv kev tshawb fawb ntawm ib txoj kev rau rau siab mus no tseem ceeb heev tivthaiv, qhov muaj yog lawv teeb tis thoob plaws hauv lub plawv chav tsev.

Plawv conduction system kuj muaj nyob rau hauv nws cov qauv ib nras ceg thaiv, losis tswvyim dabtsi atrial thiab ventricular myocardium, thiab Purkinje fibers, uas tsim synapses rau kardiomiotsitarnyh hlwb thiab muab cov kev tsim nyog interfacing ntawm nqaij contraction thiab tshee excitement. Thaum nws cov tub ntxhais, cov fiber cov ntaub ntawv yog zaum kawg branching nras ceg thaiv, txuas mus rau lub subendocardial plexus ntawm lub ventricles ntawm lub plawv.