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Cell Membrane Transport

Potassium wants to leave the cell this is from the

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Unformatted text preview: not spontaneous, needs energy Question: If a chemical gradient existed, under what conditions would a particle NOT be transported across a membrane even if it is permeable to that particle? Answer: When the electrical force is equal and opposite to the chemical force. Equilibrium Potential Equilibrium Potential (E) and membrane potential (Vsubm) Electrical force = chemical force Electrical force and chemical force act in opposite directions This shows that the sodium, as a positive particle, wants to get into the cell. Potassium wants to leave the cell This is from the electrical force Passive Transport: Simple Diffusion Passive is spontaneous. No cell energy is required Downhill movement No membrane proteins needed Transport directly through lipid bilayer Factors affecting the rate of diffusion: Magnitude of the drivi...
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