Membranas e transporte
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Transcript of Membranas e transporte
![Page 1: Membranas e transporte](https://reader034.fdocuments.net/reader034/viewer/2022052507/558380bbd8b42ac6268b5343/html5/thumbnails/1.jpg)
TRANSPORTE DE SUBSTÂNCIAS ATRAVÉS DA MEMBRANA CELULAR
COMO ESSAS DIFERENÇAS SÃO GERADAS?
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POUCAS SUBSTÂNCIAS PERMEIAM DIRETO A BICAMADA LIPÍDICA
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Transporte de materiais através da membrana
plasmática
• Difusão simples: processo de transporte em que as partículas
movimentam-se das zonas onde a sua concentração é maior para zonas onde a concentração é menor
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COMPARAÇÃO ENTRE TIPOS DE DIFUSÃO
CITOSSOL MEMBRANA FLUIDO
EXTRACELULAR
GRADIENTE DE CONCENTRAÇÃO
DIFUSÃO ATRAVÉS
DA BICAMADA
DIFUSÃO POR
CANAIS
DIFUSÃO FACILITADA
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Translocação de substâncias pela membrana
• PROTEÍNAS - CANAIS (POROS)
• PROTEÍNAS TRANSPORTADORAS
• ESPECIFICIDADE
• GASTO DE ENERGIA
• MECANISMOS
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Canais
FLUIDO
EXTRACELULAR MEMBRANA CITOSSOL
PORO
MOVIMENTO DE MOLÉCULAS
ESPECÍFICAS ATRAVÉS DE POROS HIDRATADOS
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FLUIDO EXTRACELULAR
MEMBRANA PLASMÁTICA
CITOSSOL
TRANSPORTADORES:
SUBSTÂNCIAS ESPECÍFICAS
MUDANÇA DE CONFORMAÇÃO
PROTEÍNAS TRANSPORTADORAS
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• Especificidade por S
• Cinética definida
• Saturação
• Ação de inibidores
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AQUAPORINAS
• CONTROLE DA DISTRIBUIÇÃO DE ÁGUA
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W: ÁGUA(3 Å)
F: FORMAMIDA(3,9 Å) A:ACETAMIDA
U: URÉIA M: MANITOL
Dm < Dp