Qhov sib txawv tseem ceeb ntawm cov hlab ntsha thiab cov hlab ntsha yog cov hlab ntsha txuas cov hlab ntsha thiab cov hlab ntsha thiab koom nrog hauv microcirculation thaum cov hlab ntsha nqa cov ntshav deoxygenated los ntawm cov kabmob thiab cov ntaub so ntswg rov qab mus rau lub plawv.
Feem ntau, cov ntshav oxygenated taug kev los ntawm cov hlab ntsha loj, faib ua cov hlab ntsha tshwj xeeb tsim rau cov plab hnyuv siab raum thiab cov ntaub so ntswg, txuas ntxiv mus rau hauv cov hlab ntsha, thiab thaum kawg mus txog cov kabmob thiab cov ntaub so ntswg. Tom qab ntawd, cov ntshav deoxygenated los ntawm cov kabmob thiab cov ntaub so ntswg rov qab los rau lub plawv los ntawm cov hlab ntsha. Cov feem tseem ceeb ntawm cov hlab ntshav yuav yooj yim to taub yog tias peb paub qhov txawv thiab cov yam ntxwv ntawm lawv. Li no, kab lus no sim tham txog qhov sib txawv ntawm cov hlab ntsha thiab cov hlab ntsha.
Dab tsi yog Capillaries?
Capillaries yog qhov ua haujlwm tsawg tshaj plaws ntawm cov ntshav ncig. Feem ntau, capillaries interconnect venules thiab arterioles. Capillaries tuaj yeem pauv dej, oxygen, carbon dioxide, cov tshuaj hormones, as-ham, thiab ntau ntxiv ntawm cov hlab ntsha thiab cov ntaub so ntswg ib puag ncig.
Daim duab 01: Capillaries
Capillary txaj npog lub cev raws li kev ua haujlwm thiab ua kom muaj txiaj ntsig zoo ntawm cov pa roj, cov khoom noj, thiab cov khoom pov tseg. Tsis tas li ntawd, phab ntsa ntawm capillaries tsuas muaj ib txheej ntawm tes: tunica intima. Thiab, qhov no endothelial cell-layered phab ntsa ntawm capillaries tswj kev sib pauv ntawm cov ntsiab lus.
Cov leeg yog dab tsi?
Cov hlab ntsha yog cov hlab ntsha uas nqa ntshav mus rau lub plawv. Cov leeg nqa cov ntshav deoxygenated los ntawm cov ntaub so ntswg mus rau lub plawv thiab tseem cog lus yog tias tsis muaj ntshav hauv cov hlab ntsha. Lawv khiav ze rau ntawm daim tawv nqaij thiab feem ntau nyias cov qauv nrog li qub kom ib txwm ua kom cov kev taw qhia ntws mus rau lub plawv. Cov phab ntsa ntawm cov hlab ntsha muaj peb txheej hu ua tunica externa, tunica media, thiab tunica intima. Lub tunica externa yog tuab thiab muaj cov ntaub so ntswg sib txuas. Cov tunica media muaj cov leeg du, thaum tunica intima muaj cov hlwb endothelial.
Daim duab 02: Vein
Cov leeg ntawm lub cev qis ntawm lub cev sau cov ntshav mus rau hauv ib lub nkoj hu ua inferior vena cava, thiab cov leeg ntawm sab sauv sau rau hauv lwm lub nkoj hu ua superior vena cava; ob qho no txuas mus rau txoj cai atrium ntawm lub plawv. Kwv yees li 60% ntawm tag nrho cov ntshav ntim ntawm lub cev muaj nyob rau hauv cov hlab ntsha; Yog li, cov hlab ntsha tseem hu ua capacitance hlab ntsha.
Dab tsi zoo sib xws ntawm Capillaries thiab leeg?
- Capillaries thiab veins yog ob hom hlab ntsha.
- Lawv yog ib feem ntawm cov hlab ntsha.
- Ntxiv mus, lawv muaj lub luag haujlwm thauj ntshav.
- Tsis tas li, ob hom hlab ntsha muaj txheej hu ua tunica intima hauv lawv phab ntsa.
Qhov txawv ntawm Capillaries thiab leeg yog dab tsi?
Capillaries thiab veins yog ob hom hlab ntsha. Capillaries ua haujlwm hauv microcirculation thaum cov leeg ua rau cov ntshav macrocirculation. Yog li, qhov no yog qhov sib txawv tseem ceeb ntawm cov hlab ntsha thiab cov hlab ntsha. Tsis tas li ntawd, cov txheej txheem sib txawv ntawm cov hlab ntsha thiab cov hlab ntsha yog cov hlab ntsha ntau dua thiab loj dua, thaum capillaries yog cov qauv yooj yim thiab me heev. Qhov tseeb, cov hlab ntsha muaj peb txheej sib txawv uas muaj cov ntaub so ntswg sib txuas, cov leeg du, thiab cov txheej txheem endothelial. Txawm li cas los xij, capillaries tsuas muaj ib txheej ntawm endothelial hlwb xwb.
Ntxiv mus, qhov sib txawv ntawm kev ua haujlwm ntawm cov hlab ntsha thiab cov hlab ntsha yog tias cov hlab ntsha ua rau kev sib pauv roj, cov khoom noj, cov khoom pov tseg, cov tshuaj hormones, thiab ntau lwm cov khoom ntawm cov hlab ntsha thiab cov ntaub so ntswg, hos cov hlab ntsha pab thauj cov ntshav sib txawv. qhov chaw ntawm lub cev. Qhov tseem ceeb, hom ntshav lawv nqa yog lwm qhov sib txawv ntawm cov hlab ntsha thiab cov hlab ntsha. Cov hlab ntsha tshwj tsis yog cov hlab ntsws thiab cov hlab ntaws muaj cov ntshav deoxygenated, tab sis cov hlab ntsha muaj cov ntshav oxygenated thiab deoxygenated.
Summary – Capillaries vs Veins
Capillaries yog cov hlab ntsha me tshaj plaws thaum cov hlab ntsha yog cov hlab ntsha sib piv. Capillaries ua lub txaj capillary thaum cov hlab ntsha yog cov hlab ntsha loj. Lub phab ntsa ntawm cov hlab ntsha muaj peb txheej, thaum phab ntsa ntawm capillary tsuas muaj ib txheej. Qhov tseem ceeb tshaj plaws, cov hlab ntsha nqa cov ntshav deoxygenated los ntawm cov ntaub so ntswg thiab cov kabmob mus rau lub plawv thaum capillaries pab txhawb kev sib pauv roj, cov khoom noj, cov khoom pov tseg, cov tshuaj hormones, thiab ntau lwm yam khoom ntawm cov hlab ntsha thiab cov ntaub so ntswg. Yog li, qhov no qhia txog qhov sib txawv ntawm cov hlab ntsha thiab cov hlab ntsha.
