PSYC 101 Lecture Notes - Lecture 19: Myelin, Sodium-Potassium Alloy, Action Potential
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PSYC 101 Full Course Notes
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Label & describe the function of each part of a neuron. Describe how neural impulses travel within a neuron. Describe the absolute and relative refractory periods. Differentiate b/w a postsynaptic potential and the relative refractory period. Parts of the neuron: (1) dendrites = receive info from other cells (2) soma = cell body (4) axon = long, thing fibre along which neural transmissions are conducted. Axon - could be very short or over 1m long. Nodes of ranvier travel 0. 5-10 m/s vs. myelinated travels up to 150 m/s. More na outside and more k inside. Pumps help transfer ions from one side to the other. Neuron gets signal to fire na ions rush in (through na/k channels) now more positive ions inside than outside net positive charge. Now switches back to resting stage na out and k in (through na/k pump) ((opposite of resting stage)) Either it happens or not action potential is all or nothing.
