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Anatomy and Physiology Chapter 12 Part 1: Nervous System/Neural Tissue: Anatomy and Physiology Help
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- เผยแพร่เมื่อ 25 มี.ค. 2013
- Nervous System, Neural Tissue, Neurons, Neuroglia, Conduction, Depolarization, Repolarization, Transmembrane Potential, Saltatory Propagation, Continuous Propagation
We need more professors like you. You're so easy to understand, unlike other professors who just go over it without explaining the details. I've been passing my quizzes and honestly there's no point of me going to class because I can't understand what my professor is trying to say. Just watching your videos makes me understand the whole concept. Thank you!
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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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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!
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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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If you are starting Anatomy one, you would want to start on chapter one. My videos for Anatomy one end at chapter 17. My anatomy two videos begin at 18 and end at 29. I teach biology, med term and anatomy at my college. I only have videos for anatomy and biology as of now! Best wishes!
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