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| have a single process extending from cell body that divides into two processes a short distance from the cell body. one process extends to the periphery and the other to the CNS. most afferent neurons. recieves sensory information in the dendrite-like extensions and sends information to CNS. |
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more numerous than neurons. retain their ability to divide. |
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| star shaped. provide structural support for the CNS, form a layer around blood vessels and helps form the blood-brain barrier. |
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| squamous epithelial like. line the ventricles of the brain and circulate the cerebrospinal fluid; some form the choroid plexus which produces CSF. |
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| small mobile cells. protection of the CNS from infection. phagocytic. |
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| cells with processes that can surround several axons. cell processes form myelin sheaths around axon or enclose unmyelinated axons in the CNS. |
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| single cells surrounding axons. form myelin sheaths or enclose unmyelinated axons in the PNS. |
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| schwann cells form the myelin sheath around some nerve fibers in the PNS. |
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oligodendrocytes form the myelin sheath around some nerve fibers in the CNS. do not regenerate. |
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| groups of neural cell bodies and their dendrites. |
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bundles of parallel axons with their myelin sheaths in the CNS, these are nerve tracts in the PNS, these are called nerves |
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| resting membrane potential |
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| the difference across the membrane of a resting cell |
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state in which membrane is permeable to Na+ ions for a brief period of time causing a reverse in charges inside and outside of the membrane |
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The part of the cell membrane of an axon terminal that faces the cell membrane of the neuron or muscle fiber with which the axon terminal establishes a synapse. |
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| The surface of the cell on the opposite side of the synapse from the synaptic terminal of the stimulating neuron that contains receptor proteins and degradative enzymes for the neurotransmitter. |
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| norepinephrine, acetylcholine, seratonin, dopamine, gamma-aminobutyric acid (GABA), glycine and endorphins. |
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| involuntary reactiotn in response to a stimulus applied to the periphery and transmitted to the CNS. |
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| basic functional unit of the nervous system and the smallest, simplest pathway capable of recieving a stimulus and yielding a response. |
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| two or more neurons that synapse with the same neuron |
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| axon from one neuron divides and synapses with more than one neuron. this allows information transmitted in one neural pathway to diverge into two or more pathways. |
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