PSYC 215A Lecture Notes - Lecture 4: Sodium Channel, Electric Charge, Resting Potential
6 Mar 2018
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Document Summary
Exists in two states: resting potential, action potential. Ion movement: concentration gradient: difference in concentration that allow a substance to diffuse passively from high to low, voltage gradient: difference in charge between two regions that allows a flow of two regions that are connected. Membrane resting potential: resting potential, electrical charge across the cell membrane in absence of stimulation, approx. Unequal distribution of different ions causes inside of the axon to be negatively charged. Membrane resting potential: channels and pumps help maintain the distribution of ions inside and outside the cell. Myelin sheaths & conduction: myelin, speeds up neural impulses, node of ranvier, part on an axon that is not covered by myelin, richly endowed with voltage sensitive channels. Postsynaptic potentials: excitatory postsynaptic potentials, brief depolarization of a neuron in response to stimulation, neuron is more likely to produce an action potential.
