Action Potentia1

Action Potentia1 - nervous system Action Potential * Is a...

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nervous system Action Potential * Is a sequence of rapidly occurring events that decrease and reverse the membrane potential and then eventually restore it to the resting state. * Depolarization - the loss and reversal of polarization due to the rapid opening of sodium ion channels. * Repolarization - the recovery of the resting membrane potential due to the slower opening of potassium ion channels and the closing of sodium ion channels. * Depolarization and repolarization comprise a nerve impulse and takes only 1 millisecond Initiation of a Nerve Impulses * Excitability - the ability of nerve cells to respond to stimuli and convert them into nerve impulses. * Stimulus - anything in the environment capable of changing the membrane resting potential. Initiation of Action Potential * Caused by the release of neurotransmitter * Causes change in membrane potential Propagation of Action Potential Propagation of Action Potential Local Potentials * Response of the neuron begins at the dendrites * Na
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This note was uploaded on 01/30/2012 for the course BSC BSC1085 taught by Professor Sharonsimpson during the Fall '10 term at Broward College.

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Action Potentia1 - nervous system Action Potential * Is a...

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