Cells are selectively permeable, meaning that their membranes allow some substances to cross easily while others are unable to cross without assistance. Cell membranes are selectively permeable, in part because its pores are small, allowing the cell to prevent larger molecules from moving across the membrane.Explore the role of pore size and concentration in the diffusion of a substance across a membrane.Athanasoula Aikaterini, Daniela Leone, Carmen Diez : ILS based on the "Diffusion Across a Semipermeable Membrane" Virtual lab by The Concord Consortium and on the "Membrane channels" simulation by Colorado PhET.

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