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Chapter 9 Vocabulary

Andrea Bender

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Across
5.he supportive tissue of the nervous system, including the network of branched cells in the central nervous system (astrocytes, microglia, and oligodendrocytes) and the supporting cells of the peripheral nervous system
9.The portion of the vertebrate nervous system consisting of the brain and spinal cord.
15.The junction across which a nerve impulse passes from an axon terminal to a neuron, muscle cell, or gland cell.
16.The insulating envelope of myelin that surrounds the core of a nerve fiber or axon and facilitates the transmission of nerve impulses.
20.The part of the vertebrate nervous system that regulates involuntary action, as of the intestines, heart, and glands, and that is divided into the sympathetic nervous system and the parasympathetic nervous system.
21.Nerve cells in the brain, brain stem, and spinal cord that connect the nervous system and the muscles.
23.A nerve ending that carries impulses to a muscle, gland, or organ and activates muscle contraction or glandular secretion.
24.An efferent nerve that stimulates muscle contraction.
25.the potential difference between the two sides of the membrane of a nerve cell when the cell is not conducting an impulse
27.an organ having nerve endings (in the skin or viscera or eye or ear or nose or mouth) that respond to stimulation
Down
1.he part of the vertebrate nervous system constituting the nerves outside the central nervous system and including the cranial nerves, spinal nerves, and sympathetic and parasympathetic nervous systems.
2.The portion of a nerve cell that contains the nucleus but does not incorporate the dendrites or axon.
3.A group of nerve cells forming a nerve center, especially one located outside the brain or spinal cord.
4.The transmembrane potential that must be achieved before a membrane channel can open; it differs among the various cardiac membrane channels.
6.he membrane lining the ventricles of the brain and the central canal of the spinal cord
7.A branched protoplasmic extension of a nerve cell that conducts impulses from adjacent cells inward toward the cell body. A single nerve may possess many dendrites. Also called dendron
8.the section of the nervous system responsible for sensation and control of the skeletal muscles
10.A nerve that passes impulses from receptors toward or to the central nervous system
11.a chemical by which a nerve cell communicates with another nerve cell or with a muscle
12.A constriction in the myelin sheath, occurring at varying intervals along the length of a nerve fiber.
13.Any of the small neuroglial cells of the central nervous system having long processes and amoeboid and phagocytic activity at sites of neural damage or inflammation
14.Any of the cells that cover the axons in the peripheral nervous system and form the myelin sheath
17.The electrical activity developed in a muscle or nerve cell during activity.
18.any of the star-shaped cells in the tissue supporting the brain and spinal cord
19.One of the cells comprising the oligodendroglia.
22.ny of the cordlike bundles of fibers made up of neurons through which sensory stimuli and motor impulses pass between the brain or other parts of the central nervous system and the eyes, glands, muscles, and other parts of the body
26.the long threadlike extension of a nerve cell that conducts nerve impulses from the cell body

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