PSYC 211 Lecture Notes - Lecture 3: Cerebrospinal Fluid
5 Apr 2018
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How does the action potential work within one neuron. Charged ions cannot cross the membrane- they are impermeable. Sodium in one direction and potassium in another. A protein that forms a pore- that potassium can go through. Cerebral spinal fluid is very similar to ocean salt water. Everything tends to scatter out- no clustering of ions. No organization- outside and inside the cell is 0mv. Sodium potassium pump- to pump potassium in and sodium out. Every turn over of this protein, use 1 atp molecule. A hundred times a second- a hundred atp molecules a second. A hundred billion neurons- a bunch of energy goes into working this one pump. Potassium is concentrated in and sodium is concentrated out. This pump isn"t responsible for voltage difference only for organizing ions in this matter. Properties of diffusion- potassium will leave the cell through this open door. After atp- a hundred times more potassium inside than out.
