Kuyendayenda kutaya magazi kudzera mu mtima sikumveka mosavuta. Mtima ndi chiwalo chovuta, pogwiritsa ntchito zipinda zinayi, ma valve anayi , ndi mitsempha yambiri kuti apereke magazi ku thupi. Kuyenda mumtima kuli kovuta kwambiri, ndi magazi akusuntha kupyola mu mtima, ndiye mapapo, asanabwererenso ku mtima.
Magazi amabwerera pamtima kuchokera ku thupi kudzera m'mitsuko iwiri ikuluikulu ya mitsempha yotchedwa vena cava wamkulu ndi otsika vena cava.
Mwazi uwu uli ndi mpweya wochepa, popeza ukubwerera kuchokera ku thupi kumene mpweya umagwiritsidwa ntchito.
Mwazi woyamba umalowa pa malo abwino. Icho chimadutsa mumagetsi a tricuspid kupita mu ventricle yoyenera. Pamene mtima umagunda, mpweyawu umaponyera magazi kudzera mu valasi ya pulmonic mu mitsempha ya pulmonic. Mtengo uwu ndi wapadera: Ndiwo mitsempha yokha mu thupi la munthu yomwe imanyamula magazi osauka.
Mitsempha ya pulmonic imanyamula magazi m'mapapu pomwe "imatenga" mpweya, ndipo imachoka m'mapapo ndikubwerera pamtima kudzera mu mitsempha ya pulmonic. Mwazi umaloĊµera kumtundu wamanzere, ndiye umatsika kupyolera mu valve ya mitral kumalo otsekemera. Ventiriyumu ya kumanzere imapumpha magazi kudzera mu valve ya aortic, ndi mu aorta, chotengera cha magazi chomwe chimatsogolera ku thupi lonse.
Zovuta, sichoncho?
Izi zingachititse kuti zikhale zosavuta: Popanda ma valve, zintchito za mtima sizikanatha kulimbikitsa mphamvu.
Zingakhale ngati kukwera tayala lakuda ndi phokoso lalikulu. Mutha kupopera zonse zomwe mukufuna, koma tayala silikanatha. Pankhani ya mtima, magazi amalowa m'chipindamo, ndipo amangoyenderera m'chipindacho ndikuchotsa valavu pansi, kapena kupita mmwamba molakwika nthawi iliyonse yomwe ventricle imayesera kupopera magazi.
M'malo mwake, valve pamwamba pa ventricle iliyonse imatsegula kuti idzaze, pamene valve pansi imatsimikizira kuti magazi sagwedezeka. Pamene ventricle yodzaza, valavu yapamwamba imatseka ndipo valve yapansi imatsegulidwa. Mpweya wotsekemera umagawira magazi mwachangu kudzera mu valve yapansi. Zofunikira, ma valve amasungira magazi akuyenda molondola kudzera mu mtima.
Kufotokozera mwachidule:
Magazi amachoka pamtima ndikupita ku ziwalo za thupi kuti apereke oxygen ndikuchita zinthu zina zomwe zimapangitsa moyo kukhalabe. Mwazi umabwereranso ku mtima. Choyamba, magazi amapita ku atrium yolondola, amadutsa mu vivevu ya tricuspid, ndipo amalowa njira yoyenera. Kenaka imadutsa pamphuno ya pulmonic, kupita mu mapiritsi ammapapo m'mapapo. Atatenga oxygen m'mapapu, magazi amachoka m'mapapo kupita ku mitsempha ya m'mapapo, kumalo omanzere kumanzere, kudzera m'magetsi a mitral, komanso kumalo othamanga amphamvu omwe amatsitsira magazi ku thupi kudzera mu valavu ya aortic. Mwazi ukachoka pamtima uli mu aorta kumene umatuluka kumbali zosiyanasiyana za thupi.
Zotsatira:
> Choyamba Anatomy ndi Ntchito ya Mtima. YourHeartValve.com/Edwards Lifesciences. http://www.yourheartvalve.com/heartbasics/Pages/heartanatomy.aspx
> Mtima wa Anatomy. The Texas Heart Institute ku chipatala cha St. Luke's Episcopal Hospital. http://www.texasheart.org/HIC/Anatomy/anatomy2.cfm