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Transport Proteins in a Neuron Membrane

Description
A Sodium—potassium cotransporters actively transport three Na+ out of a neuron for every two K+ they pump in. B Passive transporters allow K+ ions to move across the plasma membrane, down their concentration gradient. cytoplasm C Voltage—gated channels for Na+ or K+ are closed in a neuron at rest (left), but open when it is excited (right).
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