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Functions of the nervous system?
Coordinates and controls all bodily activities.
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Structures of the nervous system?
Nerves, brain, spinal cord, and sensory organs.
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What are sensory organs?
Eyes, ears, nose, skin, and tongue.
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What are the central nervous systems?
Brain and spinal cord.
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What are the functions of the central nervous systems?
To receive and process information and to regulate all bodily activity.
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What are the peripheral nervous system?
12 pairs of cranial nerves extending from the brain and 31 pairs of peripheral spinal nerves extending outward from the spinal chord.
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What are the functions of the peripheral nervous system?
To transmit nerve signals to, and from, the central nervous systems.
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Nerve?
Is one or more bundles of neurons that connect the brain and the spinal chord with other parts of the body.
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Tract?
Bundle of nerve fibers located within the brain or spinal chord.
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Ascending nerve tracts?
Carries nerve impulses TOWARD the brain.
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Descending nerve tracts?
Carries nerve impulses AWAY FROM the brain.
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Ganglion (gang-glee-on)?
Nerve system made up of a cluster of nerve cell bodies outside the central nervous systems.
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Innervation?
The supply of nerves to a specific body part.
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Plexus?
- Network of intersecting spinal nerves.
- Also a network of intersecting blood or lymphatic vessels.
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Receptors?
- Sites in the sensory organs that receive external stimulation.
- Sends the stimulus through the sensory neurons to the brain.
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Stimulus?
Anything that excites a nerve and causes an impulse.
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Impulse?
Wave of excitation transmitted through nerve fibers and neurons.
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