Anatomy and Physiology Chapter 12 Part 1: Nervous System/Neural Tissue: Anatomy and Physiology Help

Nervous System, Neural Tissue, Neurons, Neuroglia, Conduction, Depolarization, Repolarization, Transmembrane Potential, Saltatory Propagation, Continuous Propagation

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[@AnatomyGMC]

Once the action potential starts, depolarization begins first where the Na+ channels open and allow the Na+ to flood in at a much higher rate causing the cell's membrane potential to become more positive. (Picture a dam being removed allowing water to quickly flood). After depolarization and replolarization the Na+ K+ pump returns the intracellular and extracellular ion concentration to pre-stimulation levels. I hope this helps!

[@AnatomyGMC]

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This is one of the longest most difficult chapter due to so much Vocabulary, thanks foe the help.

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[@AnatomyGMC]

Hi! Great question, I'll do my best to answer it for you! :) When a cell is at rest, the extracellular fluid is high in Na+ and the cytoplasm is high in K+ right? There are leak channels that are always open so Na+ flows down its concentration gradient into the cell, and K+ flows down its concentration gradient out of the cell. The Na+ K+ pump is there to reverse this process by pumping three Na+ out for every 2 K+ back in. That's what keeps the cell at resting membrane potential -70 mV.

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[@AnatomyGMC]

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[@AnatomyGMC]

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