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Chapter 9 Vocabulary... Part 1

Sara Regen

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Across
1.the change in electrical potential that occurs between the inside and outside of a nerve or muscle fiber when it is stimulated, serving to transmit nerve signals.
3.one of the two types of non-nervous tissue (glia) found in the central nervous system, having macrophage activity
6.an organ having nerve endings (in the skin or viscera or eye or ear or nose or mouth) that respond to stimulation
7.a specialized, impulse-conducting cell that is the functional unit of the nervous system, consisting of the cell body and its processes, the axon and dendrites.
9.a wrapping of myelin around certain nerve axons, serving as an electrical insulator that speeds nerve impulses to muscles and other effectors.
12.the section of the nervous system responsible for sensation and control of the skeletal muscles
13.a nerve fiber that carries impulses toward the central nervous system
14.the part of the nervous system comprising the brain and spinal cord.
16.a class of cells in the brain and spinal cord that form a supporting structure for the neurons and provide them with insulation.
17.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.
18.the membrane potential of a cell that is not exhibiting the activity resulting from a stimulus
21.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.
23.A type of neuroglia cell lining the central canal of the spinal cord or the brain.
24.the membrane potential to which a membrane must be depolarized to initiate an action potential.
25.Muscles or glands that effect changes in the body
26.a cell of the peripheral nervous system that wraps around a nerve fiber, jelly-roll fashion, forming the myelin sheath.
27.a region where nerve impulses are transmitted and received, encompassing the axon terminal of a neuron that releases neurotransmitters in response to an impulse,
Down
2.the portion of the nervous system lying outside the brain and spinal cord.
4.the compact area of a nerve cell that constitutes the nucleus and surrounding cytoplasm, excluding the axons and dendrites.
5.the system of nerves and ganglia that innervates the blood vessels, heart, smooth muscles, viscera, and glands and controls their involuntary functions, consisting of sympathetic and parasympathetic portions.
8.a glial cell involved in the formation of the myelin sheaths of nerve cell axons
10.Any of the fibers in a mixed nerve that transmit motor impulses.
11.the portion of the nervous system lying outside the brain and spinal cord.
15.a star-shaped neuroglial cell of ectodermal origin.
19.the appendage of the neuron that transmits impulses away from the cell body.
20.a mass of nerve tissue existing outside the central nervous system.
22.any arborescent crystalline growth.

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