Ukulandela ukugeleza kwegazi ngenhliziyo akuyona elula njengoba kungase kubonakale. Inhliziyo iyisici esiyinkimbinkimbi, isebenzisa amakamelo amane, ama-valve amane , nemithambo yegazi amaningi ukuhlinzeka ngegazi emzimbeni. Ukugeleza ngaphakathi kwenhliziyo kuyanzima ngokulinganayo, negazi elihamba enhliziyweni, bese kuthi amaphaphu, ngaphambi kokuba abuyele enhliziyweni.
Igazi libuyela enhliziyweni kusukela emzimbeni ngezimoto ezimbili ezinkulu zegazi okuthiwa i-vena cava ephezulu kanye ne-inferior vena cava.
Legazi line-oxygen encane, njengoba libuya emzimbeni lapho kusetshenziswa oksijini.
Igazi kuqala lingena ku-atrium efanele. Ivele igeleza nge-valve ye-tricuspid ibe nge-ventricle efanele. Lapho inhliziyo ishaya, i-ventricle iqhuma igazi nge-valve ye-pulmonic ibe emthini we-pulmonic. Lo mshini uhlukile: Nguyena kuphela umthambo emzimbeni womuntu ophethe igazi elingaphansi kwe-oxygen.
Umthambo we-pulmonic uphethe igazi emaphashini lapho "uqoqa" oksijeni, futhi ushiya amaphaphu bese ubuyela enhliziyweni nge-vein pulmonic. Igazi lingena kwi-atrium yesokunxele, bese wehla nge- valve mitral ibe nge-ventricle kwesokunxele. I-ventricle engakwesokunxele iphinde iqhube igazi nge-valve ye-aortic, futhi ibe se-aorta, isitsha segazi esiholela kuwo wonke umzimba.
Kunzima, akunjalo?
Lokhu kungenza kube lula: Ngaphandle kwama-valve, i-ventricles yenhliziyo ayikwazanga ukuthuthukisa noma yimaphi amandla noma ingcindezi.
Kungaba njengokuphampa isondo elibhekene nesibalo esikhulu kulo. Ungakwazi ukupompa konke okufunayo, kodwa isondo ngeke lifake. Endabeni yenhliziyo, igazi lizofika ekamelweni, bese nje liphuma ngaphakathi ekamelweni bese liphuma ngaphandle kwe-valve ngezansi, noma ngaphezulu ukuya endleleni engafanele ngaso sonke isikhathi lapho i-ventricle izama ukupompa igazi.
Esikhundleni salokho, i-valve engaphezulu kwe-ventricle ngayinye ivula ukuyivumela ukuba igcwalise, kanti i-valve ngezansi iqinisekisa ukuthi igazi alipheli. Uma i-ventricle igcwele, i-valve ephezulu ivala futhi i-valve ephansi ivuleka. I-ventricle ikhiphe igazi ngaphandle ngamandla nge-valve engezansi. Ngokuyinhloko, ama-valve agcina igazi ligeleza ngendlela elungile ngenhliziyo.
Ukufingqa:
Igazi liphuma enhliziyweni bese liya emathisini omzimba ukuze linike umoya-mpilo futhi lenze ezinye izinto ezisekela impilo. Igazi libuyele enhliziyweni. Okokuqala, igazi ligeleza ngaphakathi kwe-atrium elungile, lidlula i-valve ye-tricuspid, futhi lenze indlela yalo ibe yi-ventricle efanele. I-ke ihamba nge-valve ye-pulmonic, ibe umthambo we-pulmonary emaphashini. Ngemva kokuthatha i-oksijeni emaphashini, igazi liphuma emaphashini liye emgodini we-pulmonary, i-atrium engakwesobunxele, ngokusebenzisa i-valve mitral, kanye ne-ventricle enamandla engakwesokunxele efaka igazi emzimbeni ngokusebenzisa i-valve ye-aortic. Uma igazi liphuma enhliziyweni ku-aorta lapho ligeleza khona ezingxenyeni ezihlukahlukene zomzimba.
Imithombo:
> Basic Anatomy kanye Nomsebenzi weNhliziyo. YourHeartValve.com/Edwards Lifesciences. http://www.yourheartvalve.com/heartbasics/Pages/heartanatomy.aspx
> Inhliziyo ye-Anatomy. I-Texas Heart Institute eStreat Luke Episcopal Hospital. http://www.texasheart.org/HIC/Anatomy/anatomy2.cfm