Unit 2 - Neuroscience and Behavior 1 Neural and Hormonal...

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Neuroscience and Behavior 1
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Neural and Hormonal Systems Module 4 2
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3 History of the Mind In 1800, Franz Gall  suggested that bumps on  the skull represented mental  abilities. His theory, though  incorrect, nevertheless  proposed different mental  abilities were modular. Phrenology Bettman/ Corbis
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4 Neural Communication The body’s information system is built from billions of  interconnected cells called  neurons. 
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5 Neuron  A nerve cell or a neuron consists of many different  parts.
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6 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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7 Action Potential Properties All-Or-None Response:  When depolarizing current  exceeds the threshold a neuron will fire, and below  threshold it will not. Intensity  of an action potential remains the same,  throughout the length of the axon.
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8 Synapse  Synapse [SIN-aps]- A junction between the axon tip  of the sending neuron and the dendrite or cell body of  the receiving neuron. This tiny gap is called the  synaptic gap or cleft.
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9 Neurotransmitters Neurotransmitters  (chemicals) released from  the sending neuron, travel  across the synapse and  bind to receptor sites on  the receiving neuron,  thereby influencing it to  generate an action  potential. 
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10 Reuptake Neurotransmitters in the  synapse are reabsorbed  into the sending neurons  through the process of  reuptake. This process  applies brakes on  neurotransmitter action.
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11 Neurotransmitters
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Unit 2 - Neuroscience and Behavior 1 Neural and Hormonal...

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