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ID number:915280
 
Author:
Evaluation:
Published: 26.02.2009.
Language: Latvian
Level: Elementary school
Literature: 5 units
References: Not used
Extract

Šūna
No šūnām veidojas audi, no audiem - orgāni, no orgāniem - orgānu sistēmas un no orgānu sistēmām veidojas organisms.

Orgāns
Orgāns ir organisma daļa ar speciālu funkciju un noteiktu formu. Orgāni ir, piemēram, sirds, aknas, smadzenes.

Pēc uzbūves izšķir blīvos orgānus un cauruļveida orgānus. Blīvie orgāni, piemēram, aknas vai nieres, sastāv no saistaudiem, kas piedod tiem formu, un pamataudiem, kas izpilda attiecīgā orgāna speciālo funkciju. Piena dziedzerī pamataudi izstrādā pienu, nierēs - urīnu. Cauruļveida orgāni, piemēram, kuņģis un zarnas, atgādina vaļēju cauruli, tie savienoti ar ārējo vidi.…

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