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Anatomy, Medicine and Hygiene

 Sirdsdarbība
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ID number:207277
 
Author:
Evaluation:
Published: 26.07.2007.
Language: Latvian
Level: Secondary school
Literature: n/a
References: Not used
Extract

Sirds automātisms. Organismam atrodoties relatīvā miega stāvoklī, sirds saraujas (kontrahējas) apmēram 100 000 reizes diennaktī un pārsūknē aptuveni 10 t asiņu. Sirds saraušanās funkciju nodrošina sirds muskulatūra, kas ir līdzīga skeleta muskulatūrai.
Sirds muskulī atrodas īpašas šūnas, kurās periodiski rodas uzbudinājums, kas izplatās pa abu priekškambaru un abu kambaru muskulatūru. Tāpēc abas sirds daļas saraujas secīgi – vispirms priekškambari, pēc tam kambari.…

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