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| functional unit of nervous system |
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| Most of a neuron’s organelles are in the |
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| highly branched extensions that receive signals from other neurons |
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| a much longer extension that transmitssignals to other cells at synapses |
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| cone-shaped base of an axon |
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| one axon passes information across the synapse in the form of chemical messengers |
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a junction between an axon and another cell |
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| Information is transmitted FROM (a neuron) TO a neuron, muscle, or gland cell called? |
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| presynaptic cell to a postsynaptic cell |
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| Most neurons are nourished or insulated by cells called |
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| Nervous systems process information in three stages: |
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sensory input, integration, and motor output |
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| Processing of information takes place in simple clusters of neurons called? |
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| a more complex organization of neurons called |
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| Sensors detect external stimuli and internal conditions and transmit information along |
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| Sensory information is sent to the brain or ganglia, where _______ integrate the information |
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Motor output leaves the brain or ganglia via _____ _____, which trigger muscle or gland activity |
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| where integration takes place; this includes the brain and a nerve cord |
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| central nervous system (CNS) |
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| which carries information into and out of the CNS |
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| peripheral nervous system (PNS) |
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| The neurons of the PNS, when bundled together, form |
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| the electrical current flows from one neuron to another |
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| a chemical neurotransmitter carries information across the gap junction |
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