Chapter 4 - Neural Conduction

Chapter 4 - Neural Conduction - ACTIO POTE TIAL CO...

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(Chapter 4) Web Link: Action potentail and Conduction . http://psych.hanover.edu/Krantz/neurotut.html Neurons are the functional units of the nervous system. What is the property that allows them to interact with each other? Neurons are capable of signaling Neurons communicate by sending electrical signals called Action Potentials : produced by the movement of ions in and ou t of the neuron, through the cell membrane. Ions are charged particles: Positive charges: cations Negative charges: anions The cell mebrane is a lipid bilayer which does not allow the passage of ions Membrane has protein channels that allow the passage of ions protein channels are very selective What are the forces that move the ions across the cell membrane? Ions move along gradients of potential energy . What is potential energy? In the neuron, ions are moved by two forces (potential energy): 1.- Concentration gradient (Fig. 4.1) Due to Concentration gradient between inside and oustside the membrane
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K+: OUT A- : OUT ( large ions:proteins, RNA, DNA, etc, cannot leave the cell) Na+: Cl- : I& 2. Electrical gradient Model of neuron: what happens if K+ channels open? Movement of K+ along a CO&CE&TRATIO& gradient creates an ELECTRICAL gradient (FIG. 4.2).
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This note was uploaded on 04/04/2012 for the course PSYCH 202 taught by Professor Kim during the Fall '06 term at University of Washington.

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Chapter 4 - Neural Conduction - ACTIO POTE TIAL CO...

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