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Chapter 9 Vocabulary (Part 1)

Aje' Frazier

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Across
3.The long threadlike part of a nerve cell along which impulses are conducted from the cell
5.A type of neuroglia cell lining the central canal of the spinal cord or the brain
8.The part of the peripheral nervous system that is responsible for carrying motor and sensory information
15.A short-lasting event in which the electrical membrane potential of a cell rapidly rises and falls
19.An organ having nerve endings (in the skin or viscera or eye or ear or nose or mouth) that respond to stimulation
20.The part of the nervous system responsible for control of the bodily functions not consciously directed
21.Electrically excitable cell that processes and transmits information by electrical and chemical signaling
22.A structure that permits a neuron to pass an electrical or chemical signal to another cell
25.The branched projections of a neuron that act to conduct the electrochemical stimulation
26.A type of glial cell that are the resident macrophages of the brain and spinal cord
27.The membrane potential to which a membrane must be depolarized to initiate an action potential
Down
1.A nerve fiber that carries impulses toward the central nervous system
2.Consists of the nerves and ganglia outside of the brain and spinal cord
4.The supportive tissue of the nervous system
6.Endogenous chemicals that transmit signals from a neuron to a target cell across a synapse
7.A nerve fiber that carries impulses toward the muscles or glands
9.Any cell that covers the nerve fibers in the peripheral nervous system and forms the myelin sheath
10.An organ or cell that acts in response to a stimulus
11.The electrical potential of a neuron or other excitable cell relative to its surroundings when at rest
12.A star-shaped glial cell of the central nervous system
13.The part of the nervous system that integrates the information that it receives from
14.A glial cell resembling an astrocyte but smaller with few and slender processes having few branches
16.The gaps formed between the myelin sheaths generated by different cells
17.Any of the cordlike bundles of fibers made up of neurons through which sensory stimuli and motor impulses pass between the brain
18.The insulating envelope of myelin that surrounds the core of a nerve fiber or axon and facilitates the transmission of nerve impulses
23.The part of a neuron containing the nucleus but not incorporating the axon and dendrites
24.A structure containing a number of nerve cell bodies, typically linked by synapses, and often forming a swelling on a nerve fiber

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