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Physiology, 2nd Faculty of Medicine, Charles University Copyright © 2010 Ludek Nerad
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Content
Terminology
What action potential really means
Where we can find it
Neurones
Networks of neurones
Processing of information
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Physiology, 2nd Faculty of Medicine, Charles University Copyright © 2010 Ludek Nerad
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A temporary reversal in the potential difference across a plasma membrane that occurs when a cell has been activated by a stimulus.
Action potential definition
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Physiology, 2nd Faculty of Medicine, Charles University Copyright © 2010 Ludek Nerad
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Potential energy = potential to deliver work
U = m x g x h
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Physiology, 2nd Faculty of Medicine, Charles University Copyright © 2010 Ludek Nerad
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Tsunami
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Physiology, 2nd Faculty of Medicine, Charles University Copyright © 2010 Ludek Nerad
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U = Q1 x Q2 / r
= 1.5 V
~ 220 V
U … voltage
Q1 … charge
Q2 … charge
r … distance
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Electric potentialis a voltage thatwe measure witha voltmeter.
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Physiology, 2nd Faculty of Medicine, Charles University Copyright © 2010 Ludek Nerad
Introduction To Action Introduction To Action PotentialPotential
PhysiologyPhysiologypage 2page 2
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Electric potentialis a voltage thatwe measure witha voltmeter.
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Physiology, 2nd Faculty of Medicine, Charles University Copyright © 2010 Ludek Nerad
Introduction To Action Introduction To Action PotentialPotential
PhysiologyPhysiologypage 2page 2
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Electric potentialis a voltage thatwe measure witha voltmeter.
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Electric currentis a movement offree electrons.
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Ions exert forceon free electronswhich move thevoltmeter pointer.
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Physiology, 2nd Faculty of Medicine, Charles University Copyright © 2010 Ludek Nerad
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Physiology, 2nd Faculty of Medicine, Charles University Copyright © 2010 Ludek Nerad
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Where can we see action potential?
NeuronesPacemakercells
Neuromuscular junction
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Physiology, 2nd Faculty of Medicine, Charles University Copyright © 2010 Ludek Nerad
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Physiology, 2nd Faculty of Medicine, Charles University Copyright © 2010 Ludek Nerad
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PhysiologyPhysiologypage 2page 2
Action potentialAction potential
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Physiology, 2nd Faculty of Medicine, Charles University Copyright © 2010 Ludek Nerad
Introduction To Action Introduction To Action PotentialPotential
PhysiologyPhysiologypage 2page 2
Conduction in myelinated vs. non-myel. neurones
10 – 120 m/s10 – 120 m/s
5 - 25 m/s5 - 25 m/s
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Physiology, 2nd Faculty of Medicine, Charles University Copyright © 2010 Ludek Nerad
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Saltatory conduction
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Physiology, 2nd Faculty of Medicine, Charles University Copyright © 2010 Ludek Nerad
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5 m5 m18 m18 m
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Physiology, 2nd Faculty of Medicine, Charles University Copyright © 2010 Ludek Nerad
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Physiology, 2nd Faculty of Medicine, Charles University Copyright © 2010 Ludek Nerad
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Synaptic transmission
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