Le kwegazi - ngeshishini lezobunjineli wobugcisa

Ngaba unokuyithelekelela indlu apho inkqubo igiza ezinobunzima ezaliswe ulwelo ezixabisekileyo kakhulu kakuhle uthutha amanzi, ukutya, ioksijini kwaye kususa inkunkuma? Ukongeza, imibhobho ngokwabo bayakwazi ngokwabo ukubuyisa kwaye zikhula, wamkela utshintsho endlwini. Esi sakhiwo engineering abangele baziswa abantu bonke.

Kodwa inkqubo yokujikeleza uyakwazi ngaphezulu. UMthetho iqondo lobushushu emzimbeni, hambisa inani elikhulu zamadlala ezahlukeneyo nadlulisela ulwazi olubalulekileyo kuzo zonke iiseli, ukulungiselela ukhuseleko xa ulele. Olu thungelwano bhetyebhetye ngokupheleleyo yaye ethambileyo, ngoko ke unako ukufunxa zonke uyothuka kwaye lukwazi umzimba. Makhe sijonge le wobugcisa eduze.

Ubume kwegazi abantu

Embindini inkqubo yokujikeleza liqumrhu umngxuma - intliziyo, efana nempompo gqolo iimpompo igazi ndzhendzheleko closed, ezibandakanya kwimikhumbi.

Inkqubo yonke yahlulwe amacandelo amabini:

• ejikeleza yemiphunga. olujikeleza edibanisa kunye intliziyo kunye nemiphunga. Eqalisa isangqa ventricle ekunene, ukuphela kwayo kuxhomekeke intendelezo ekhohlo. Oku kusebenza kuphela emiphungeni.

• A Isangqa enkulu nokuhamba kwegazi. It asuka kwi aorta kwaye iphela intendelezo ekunene.

Large ejikelezayo for nempahla yaso njengoko etyhutyha umzimba wonke.

Heart ngoncedo kweendonga longitudinal yahlulwe ezimbini. Ngalinye kula maqela ahlulwe kubini ezimbini ngokusebenzisa izahlulelo tyaba, akha ventricle kunye intendelezo.

Igazi kuqala ungena isitya iphambili zomzimba - i aorta. aorta Eminye yahlulwe ezityeni amancinane, kwaye igazi lingena kwemithambo le kwegazi. Ngokuthe ngcembe kwemithambo lwamasebe noko benjalo, badlule kungena arterioles kunye emithanjeni. Ubukhulu be emithanjeni liphantsi kakhulu - malunga 10 microns. Oku kuthetha ukuba iiseli ezibomvu zegazi, ethwala ioksijini Kwathi iiseli ngenxa emithanjeni ngexesha. Iindonga iimpahla capillary zibhityile kakhulu - kwenziwa kuphela umaleko ube mnye iiseli, kodwa oko akuthethi ukuthintela unikezelo mzimba ancedisana luphezulu kwinxalenye engamanzi igazi (plasma). Kwangaxeshanye kwithishyu ibe emithanjeni ezosulela dioxide kunye pathways iimveliso carbon efuna ukususwa emzimbeni.

Le emithanjeni babe isihlunu encinane loopy, esebenzisa apho bakwazi ukulawula umthombo wegazi udlulayo ngabo, ukuba ukuhlangabezana neemfuno kwizihlunu ezingqongileyo. Xa igazi liphuma emithanjeni, ingena imithambo ezincinane - venules. Venules coalesce ngakumbi emithanjeni, igazi kubo iyaqhubeka ukuba ingene kwegazi, babuyele intliziyo. Ngemithambo of wegazi lingaphantsi kwe kwi imithambo, kodwa lumens of emithanjeni ngaphezulu.

njani intshukumo esahlukileyo kuqinisekiswa njani?

Ngenxa lithathelwe lihle:

• Le ndebe-ezimile valve ethintela igazi zazamazama entliziyweni phantsi kwempembelelo womxhuzulane.

• Umsebenzi we izihlunu skeletal, leyo compress imithambo ngokusondeleyo bebekwe ngokwahlukeneyo omnye, ukutyhala igazi nge kwemithambo ngendlela enye-kwicala kwentliziyo.

• uxinzelelo ngaphakathi esifubeni nesisu ngexesha ukuphefumla iyahluka kunceda imithambo yokumpompa igazi intendelezo ekunene.

Xa valve lwemithambo ngenxa yaso nasiphi na isizathu (ukukhulelwa, yofuzo ilifa, nokutyeba okanye umgama omde) azisebenzi kakuhle, igazi lwasemoyeni ngemithambo adumbe phantsi kwemithambo. Le meko ke yaziwa ngokuba mithambo varicose.

Le kwegazi lifezekisa ioksijini nobuchopho iiseli. Ngoko ke, lo kwegazi ingqondo ikhutshwa phandle imithetho efanayo onke amanye amalungu. Ukuba nencindi lwemithambo empahleni zobuchopho kunzima, ngoko kukho isiyezi kunye yintloko.

Okumangalisayo kukuba, ukusebenza kwenkqubo yokujikeleza womntu phezulu kangangokuba ukuphumla ukuba ngomzuzu omnye, malunga 5 iilitha igazi udlula intliziyo kunye elide seelitha malunga 35 ngomzuzu.

Njengoko ubona uMdali wethu ngokwenene umyili omkhulu, ogama umlandu ngesandla - lo kwegazi - eziludumo!