Ch2part2 - Ch 2 CELLS OF THE NERVOUS SYSTEM Continued What...

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CELLS OF THE NERVOUS SYSTEM Continued Ch 2
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What Causes the Membrane Potential? +ve charge outside and –ve charge inside Large molecules carry a negative charge and never leave the neuron More Na+ ion outside more K+ ion inside as a protein called the sodium-potassium transporter lets 3 (Na+) ions out per 2 (K+) ions in. Protein channels let some ions pass but not other ions to create environments with charges.
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Why Does the Membrane Potential Change? Two Primary Forces on Ions 1. Diffusion : • The process whereby molecules distribute themselves evenly throughout water • Move from high to low concentrations 2. Electrostatic Pressure : The pressure exerted by charges: • like charges repel (+ +) or (- -) • opposite charges attract (+ -)
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