PSYC314 Chapter Notes - Chapter 2: Axoplasmic Transport, Axon Terminal, Potassium Channel
3 Mar 2016
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Chapter 2 highlights (aka stuff i don"t know) Schwann cells: in the pns; support axons and produce myelin; aid in digestion of dead and dying axons, and then act as a guide for axon regrowth. Depolarization occurs because the inside of an axon is negative and a positive charge is being applied. Electrostatic pressure: the attractive force between atomic particles charged with opposite signs, or the repulsive force between atomic particles charged with the same sign. Organic anions: (a-) negatively charged proteins and intermediate products of the cell"s metabolic processes. It remains in greatest quantity in the positive extracellular fluid because sodium-potassium pumps constantly push it out of the axon, which is attracting it due to its negative charge. Sodium-potassium transporters: protein molecules embedded in the membrane that exchange na+ for k+ to keep the intracellular na+ concentration low and slightly increase the intracellular k+ concentration.
