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ID number:715814
 
Evaluation:
Published: 23.04.2012.
Language: Latvian
Level: Elementary school
Literature: n/a
References: Not used
Extract

Katru dzīvo šūnu apņem šūnas membrāna. Membrāna regulē vielu plūsmu starp šūnu un ārvidi, veic pinocitozi (šķidru pilienu uzņemšanu) un fagocitozi (cietu daļiņu uzņemšanu), kas uztver kairinājumu un vada ierosu. Tās biezums ir tikai 7,5 nm. Membrānā ir divi lipīdu slāņi un olbaltumvielas, kas it kā ‘’peld’’ lipīdos. Šūnas ārējā membrānā ir poras, kuru diametrs ir 0,35-0,8 nm. Augu šūnām virs membrānas ir biezs šūnapvalks, kas sastāv no celulozes un citām vielām. Dzīvnieku šūnām šūnapvalka nav.…

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