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Chapter 9 Vocabulary

Emily Kounlavong

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Across
5.Any of the cells that cover the axons in the peripheral nervous system and form the myelin sheath
6.a nerve fiber that carries impulses toward the central nervous system
10.a molecule on the surface or within a cell that recognizes and binds with specific molecules, producing a specific effect in the cel
12.The usually long process of a nerve fiber that generally conducts impulses away from the body of the nerve cell.
15.a class of cells in the brain and spinal cord that form a supporting structure for the neurons and provide them with insulation
16.the system of nerves and ganglia that innervates the blood vessels, heart, smooth muscles, viscera, and glands and controls their involuntary functions
18.a gap occurring at regular intervals between segments of myelin sheath along a nerve axon.
20.a star-shaped neuroglial cell of ectodermal origin.
23.Motor pathways of the periphel nervous system that lead to the skin and skeletal muscles
24.The part of a neuron containing the nucleus but not incorporating the axon and dendrites
25.Nerve Cells
26.a region where nerve impulses are transmitted and received, encompassing the axon terminal of a neuron that releases neurotransmitters in response to an impulse, an extremely small gap across which the neurotransmitters travel
27.Any of the fibers in a mixed nerve that transmit motor impulses.
Down
1.the membrane potential of a cell that is not exhibiting the activity resulting from a stimulus
2.The nerve has to reach threshold before it could go through an impulse
3.the electrical activity developed in a muscle or nerve cell during activity.
4.Part of the nervous system outside the central nervous sytem
7.a wrapping of myelin around certain nerve axons, serving as an electrical insulator that speeds nerve impulses to muscles and other effectors.
8.any of several chemical substances, as epinephrine or acetylcholine, that transmit nerve impulses across a synapse to a postsynaptic element, as another nerve, muscle, or gland.
9.Brain and spinal cord
11.the branching process of a neuron that conducts impulses toward the cell.
13.one or more bundles of fibers forming part of a system that conveys impulses of sensation, motion, etc., between the brain or spinal cord and other parts of the body
14.Neuroglia consisting of cells similar to but smaller than astrocytes, found in the central nervous system and associated with the formation of myelin.
17.A type of neuroglia cell lining the central canal of the spinal cord or the brain.
19.A nerve ending that carries impulses to a muscle, gland, or organ and activates muscle contraction or glandular secretion
21.a mass of nerve tissue existing outside the central nervous system.
22.found in the central nervous system, having macrophage activity

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