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ID number:332859
 
Author:
Evaluation:
Published: 20.01.2009.
Language: Latvian
Level: Secondary school
Literature: n/a
References: Not used
Extract

otrmutnieku dzīvnieku tips
divpusīgi simetrisks (bilaterāls) ķermenis( galva, viduklis un aste (izņēmums ir tunikāti).
Ķermeni balsta ass skelets, kas ir blīvas, nedalītas vai posmainas stiegras (hordas) veidā. Virs ass skeleta atrodas centrālā nervu sistēma, kurai ir biezsienu caurules veids.
Zem ass skeleta atrodas ķermeņa dobums — celoms, kurā atrodas gremošanas orgāni, izvadorgāni un vairošanās orgāni.
Gremošanas kanāls priekšgalā atveras ar ievadatveri, bet pakaļgalā ar izvadatveri, un tā sākuma nodalījumā (rīklē) atrodas pāra žaunu spraugu rindas.
Vēl zemāk zem gremošanas kanāla atrodas centrālais asinsrites orgāns — sirds.…

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