Osmosis y transporte de membrana 02.08.2010
Transcript of Osmosis y transporte de membrana 02.08.2010
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OSMOSIS, MEMBRANA CELULAR Y TRANSPORTE
PROFESOR:FÉLIX VIDELA CURSO:PRIMERO MEDIO
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Osmosis: Se define como una difusión (traspaso) pasiva (sin gasto de energía),
caracterizada por el paso del agua, disolvente, a través de la membrana semipermeable
(membrana plasmática), desde la solución más diluida a la más concentrada.
Recuerda que las células que poseen membrana celular o plasmática, son dos:
•La célula animal
•La célula vegetal
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SOLUCIONES QUIMICAS
SOLUTOSOLVENTE
Soluciones concentradas y
soluciones diluidas.
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http://www.biologia.edu.ar/animaciones/temas/ciclos/osmosis.html
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http://www.youtube.com/watch?v=7WX8zz_RlnE&feature=related
Solución diluida (hipotónica)
Solución concentrada (hipertónica)
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¿POR DONDE ENTRA O SALE AGUA EN LA
CELULA?
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¿Qué ocurre cuando se ingiere un laxante?
¿Qué ocurre cuando se consume mucha sal?
¿Por qué a una persona deshidratada le aplican suero y no agua directamente ?
¿Qué es la homeostasis?
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MEMBRANA PLASMATICA
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DIFUSION SIMPLE
Atraviesan la membrana:•Lípidos: colesterol, hormonas lipidicas, y señales celulares de origen lipidico.•Moléculas pequeñas apolares; gases CO2, NO, O2
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CANALES IONICOS
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