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Lecture Slides of Nerve Impulses I Anatomy and Physiology
- Summary • 20 pages • 2023
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The text discusses how nerve impulses travel along nerve pathways. There are four main steps involved: 
 
1) Resting potential. At rest, the interior of the neuron cell is negatively charged due to sodium-potassium pumps that actively transport sodium ions out and potassium ions in. 
 
2) Depolarization. When a threshold stimulus is received, sodium ion channels open and sodium ions diffuse into the cell, making the interior more positively charged and depolarizing the membrane. 
 
3) Repolariz...