bio 101 Neuron Action potential 2

bio 101 Neuron Action potential 2 - Na+ Na+ K+ Na+ Na+ K+...

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OUTSIDE INSIDE + + + + K + K + K + K + K + K + K + K + K + K + K + K + K + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + + Na + ATP ATP Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + Na + K + K + K + K + K + K + K + K + K + K + K + K + K + K + K + K + REST = -65mV ACTION POTENTIAL
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Action Potential Handout
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Fig 45.11
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POSITIVE FEEDBACK
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Why does the signal only travel in one direction?  Na  channels are  refractory  — once they 
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Vertebrate Action Potentials Axons are much smaller and have Schwann cells wrapped around them
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Myelin Sheath = insulation Multiple Sclerosis occurs when nerves become de-myelinated
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Myelinated Axons Fig 45.9
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What happens when the Action Potential reaches the end of the Axon?
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This note was uploaded on 04/06/2011 for the course BIO 101 taught by Professor Freeman during the Spring '11 term at Union.

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bio 101 Neuron Action potential 2 - Na+ Na+ K+ Na+ Na+ K+...

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