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Biologija

Pavyzdinė pamoka
by

g r

on 28 December 2010

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Transcript of Biologija

Širdis Širdis (lot. cor) – raumeninis, netaisyklingo kūgio formos, maždaug kumščio dydžio tuščiaviduris vidaus organas, varantis kraują. Kaip veikia širdis ? Kaip veikia vožtuvai? Širdies smūgis Staigi širdies raumens (miokardo) tam tikro ploto žūtis (nekrozė) arba jo negrįžtamas pakenkimas. Širdies vožtuvas yra jungiamojo audinio darinys, kilęs iš embrioninių mezenchimos ataugų, vadinamų širdies vamzdeliais. Širdies vožtuvai
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