domingo, 4 de janeiro de 2009

O que é Retículo Endoplasmático Rugoso (RER) ?


O que é Retículo Endoplasmático Rugoso (RER) ?

Resumo: Túbulos e sacos achatados recobertos externamente por ribossomos que sintetizam moléculas de proteína que são conduzidas para o interior.

Retículo Endoplasmático Rugoso (RER) é formado por sistemas de túbulos achatados e ribossomos aderidos a membrana o que lhe confere aspecto granular.

Função: O RER participa da síntese de proteínas, que serão enviadas para o exterior das células. O reticulo endoplasmático é também chamado ergastoplasma, palavra originada do grego ergozomai, que significa elaborar, sintetizar. Esse tipo de retículo é muito desenvolvido em células com função secretora. É o caso por exemplo das células do pâncreas, que secretam enzimas digestivas, e também o caso das células caliciformes da parede do intestino, que secretam muco. A microscopia eletrônica revelou a presença, no interior do citoplasma, de um retículo de membranas lipoprotéicas que foi denominado retículo endoplasmático (RE). Conforme a posição das membranas, podemos distinguir a existência de túbulos e saculos ou vesículas achatadas .O retículo endoplásmatico rugoso apresenta as seguintes funções: aumenta a superfície interna da célula, o que amplia o campo de atividade das enzimas, facilitando a ocorrência de reações químicas necessárias ao metabolismo celular, síntese de proteínas(sua principal função) e armazenamento. Graças aos ribossomos aderidos a suas membranas,o reticulo endoplasmático granuloso atua na produção de certas proteínas celulares, como o colágeno que é uma proteína produzida pelo RER do fibroblasto.

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