Purkinje fibers nyob rau hauv lub plawv

Peb lub siab - ib leeg uas muaj ib tug heev txawv mechanism ntawm contraction. Hauv nws yog ib tug complex system ntawm kev hlwb (pacemakers), uas muaj ib tug multi-level lag luam tswj system. Nws kuj muaj thiab cov Purkinje fibers. Lawv muaj nyob rau hauv lub ventricular myocardium thiab yog lub luag hauj lwm rau lawv synchronous contraction.

General cev ntawm lub vascular system

Plawv conduction system yog conventionally muab faib ua plaub qhov chaw los ntawm anatomists. Thawj feem muab cov sinoatrial (sinoatrial) ntawm. Nws yog ib tug ua ke ntawm peb bundles ntawm hlwb uas tsim pulses nrog ib zaus ntawm yim caum - ib puas thiab nees nkaum lub sij hawm ib feeb. Qhov no ceev tso cai rau lub plawv dhia kom muaj txaus cov ntshav ncig nyob rau hauv lub cev, saturation nrog rau oxygen thiab metabolic nqi.

Yog hais tias rau ib co yog vim li cas cov thawj pacemaker yuav tsis ua nws txoj kev ua, nws yuav siv sij hawm lub atrioventricular (atrioventricular) ntawm. Nws yog nyob rau ntawm tus ciam teb ntawm lub plawv lag nyob rau hauv nruab nrab muab faib. Qhov no pawg ntawm hlwb yog lub zaus tus nqi nyob rau hauv ntau ntawm rau caum rau eighty cwj nrag thiab yog ib tug thib ob kev txiav txim pacemaker.

Cov theem tom ntej ntawm lub conduction system - nws yog ib lub nras uas Nws thiab cov Purkinje fibers. Lawv muaj nyob rau hauv lub interventricular septum thiab entwine lub apex ntawm lub plawv. Qhov no ua rau nws ua tau rau sai sai faib cov hluav taws xob impulses ntawm lub ventricular myocardium. generating ceev mas nws txawv ntawm plaub caug rau caum lub sij hawm ib feeb.

ntshav mov

Qhov ntawm lub conduction system, uas yog nyob rau hauv lub atria, tau txais cov as-ham los ntawm cais qhov chaw, nyias los ntawm tus so ntawm myocardium. Sinoatrial ntawm noj los ntawm ib tug los yog ob tug me me cov hlab ntsha uas yog nyob rau hauv lub tuab phab ntsa ntawm lub plawv. Feature yog lub xub ntiag ntawm ib tug disproportionately loj leeg uas kis tau los ntawm nruab nrab ntawm. Qhov no ceg ntawm txoj cai coronary artery. Nws, nyob rau hauv lem, muab ib tug ntau ntawm me me ceg uas tsim ib tug tuab network ntawm arterial-venous nyob rau hauv cov cheeb tsam no atrial cov ntaub so ntswg.

Nras ntawm Nws thiab Purkinje fibers, dhau lawm, yog powered los ntawm cov ceg ntawm txoj cai coronary artery (menyuam tub) los yog ncaj qha los ntawm nws tus kheej. Nyob rau hauv tej rooj plaub, cov ntshav yuav ntws rau hauv tus qauv ntawm lub circumflex leeg. Muaj tseem tsim ib tug tuab network ntawm cov hlab ntsha uas yog nruj nreem entwine cardiomyocytes.

Hlwb ntawm cov thawj hom

Txawv ntawm lub hlwb, uas yog ib feem ntawm lub conductive system, vim lub fact tias lawv muaj ntau zog. Muaj peb hom hlwb.

Ua pacemakers yog n hlwb los yog lub hlwb ntawm cov thawj hom. Morphologically, nws yog ib tug me me mob hlwb nrog ib tug loj nucleus thiab ib tug ntau ntawm ntev tua, intertwined. Ob peb nyob sib ze hlwb pom tau hais tias raws li ib tug pawg, koom los ntawm ib tug ntau qab daus membrane.

Yuav kom muaj ib tug contraction nyob rau hauv lub internal nruab nrab P hlwb txheej txheem bundles ntawm myofibrils. Cov ntsiab nyob tsawg kawg yog ib tug peb lub hlis twg ntawm tag nrho cov qhov chaw ntawm lub cytoplasm. Lwm yam organelles across pov tseg nyob rau hauv lub cell thiab me tshaj nyob rau hauv ib txwm cardiomyocytes. Ib tug raj cytoskeleton, conversely, cov txheej txheem densely thiab muaj tus duab ntawm pacemakers.

Los ntawm cov hlwb muaj Sino-atrial ntawm, tab sis lwm yam hais, nrog rau cov Purkinje fibers (histology uas yuav tsum tau piav rau hauv qab no) muaj ib tug txawv qauv.

Lub hlwb ntawm lub thib ob hom

Lawv kuj hu ua hloov los yog latent pacemakers. Irregularly zoo li tus, luv dua li ib txwm cardiomyocytes, tiam sis yuav tau ib tug ntau dua thickness haum ib tug ob nuclei, thiab nyob rau hauv lub cell phab ntsa muaj sib sib zog nqus ua si nraum zoov. Organelles nyob rau hauv cov hlwb tshaj nyob rau hauv lub cytoplasm ntawm hlwb n.

Lub contractile xov mus raws qhov ntev axis ntawm lub cell. Lawv yog cov thicker thiab muaj ib tug ntau ntawm sarcomeres. Qhov no tso cai rau lawv mus yuav cov neeg tsav tsheb ntawm lub thib ob-thiaj nqi. Hlwb cov txheej txheem ntawm nyob rau hauv cov ntaub ntawv atrioventricular ntawm thiab lub nras uas Nws thiab Purkinje fibers slides rau lub thib peb hom hlwb uas hais.

Lub hlwb ntawm peb hom

Histology nrhiav tau ob peb hom hlwb nyob rau hauv lub davhlau ya nyob twg ib feem ntawm lub mob conduction system. Raws li cov kev faib ntawm peb hom ntawm tes xam tau tias yog no yuav muaj ib tug zoo qauv rau cov neeg uas ua tau lub Purkinje fibers nyob rau hauv lub plawv. Lawv yog cov ntau voluminous tshaj lwm pacemakers, ntev thiab dav. Thickness txawv myofibrils ntawm tag nrho cov fiber seem, tab sis tus nqi ntawm cov contractile ntsiab yog ntau tshaj nyob rau hauv lub qub cardiomyocytes.

Tam sim no peb muaj peev xwm muab piv rau peb hom hlwb nrog cov neeg uas ua tau lub Purkinje fibers. Histology (npaj tau los ntawm ntaub so ntswg ntawm lub plawv apex) ntawm cov ntsiab yog ho txawv. Cov tub ntxhais muaj ib tug tshuam lub zoo, thiab contractile fiber tsim heev tsis muaj zog, thiab muaj ntau yam ceg sib thooj. Nyob rau hauv tas li ntawd, lawv tsis tsom kom meej meej rau qhov ntev ntawm lub cell thiab cov txheej txheem ntawm nyob rau hauv ntev Team sib. Scant nqi organelles uas yog txheej txheem ib ncig ntawm lub myofibrils.

Txawv nyob rau hauv lub zaus ntawm cov generated pulses thiab cov kev ceev ntawm lawv tua, yuav tsum tau ib tug phylogenetically tsim synchronization mechanism thaum lub sij hawm tus txheej txheem ntawm kev txo tag nrho cov qhov chaw ntawm lub plawv.

Histological txawv conduction system ntawm cardiomyocytes

Lub hlwb ntawm lub thib ob thiab thib peb hom muaj ib tug ntau dua tus nqi ntawm glycogen thiab nws cov metabolites dua li ib txwm cardiomyocytes. Qhov no feature yog tsim los qhia kom txaus yas los npog lub cell muaj nuj nqi thiab cov as yuav tsum. Cov enzymes lub luag hauj lwm rau lub glycolysis thiab glycogen synthesis, ntau npaum li cas active nyob rau hauv lub hlwb ntawm lub conduction system. Nyob rau hauv cov ua hauj lwm lub plawv hlwb cai cov lus rov qauv. Vim li no cov feature yooj yim kom txo tau cov me nyuam ntawm cov pa kis pacemakers, nrog rau cov Purkinje fibers. Qhov npaj ntawm tus kev system tom qab kev kho mob ntawm sib active tshuaj qhia siab ua si nrog holineserazoy thiab lysosomal enzymes.