Module 4 - Neural and Hormonal Systems Module 4 1 Neuron A...

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1 Neural and Hormonal  Systems Module 4
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2 Neuron  A nerve cell or a neuron consists of many different  parts.
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3 Action Potential A neural impulse. A brief  electrical charge that travels  down an axon generated by  the movement of positively  charged atoms in and out of  channels in the axon’s  membrane. 
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4 When does a neuron “fire”?  Neurons receive a ton of messages from the  environment and/or other neurons Excitatory (a.ka. depolarizing) messages- Increase  amount of positive ions in the cell and encourage  firing Inhibitory (a.k.a. hyperpolarizing) messages-  Decrease pos. ions and discourage firing When the sum of all messages result in enough  depolarization (depolarization threshold), the neuron  “fires”
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5 Refractory Period:  After a neuron has fired an action  potential it pauses for a short period to recharge 
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Module 4 - Neural and Hormonal Systems Module 4 1 Neuron A...

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