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CH.9 VOCABULARY

Brittany Moore

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Across
1.The change in electrical potential associated with the passage of an impulse along the membrane of a muscle cell or nerve cell
3.The brain and spinal cord. Chemical: Substance capable of altering body function.
5.A structure containing a number of nerve cell bodies, typically linked by synapses, and often forming a swelling on a nerve fiber
6.A junction between two nerve cells, consisting of a minute gap across which impulses pass by diffusion of a neurotransmitter
9.The somatic nervous system (SNS) is the part of the peripheral nervous system associated with the control of body movements through the action of skeletal muscles, and with reception of external stimuli, which helps keep the body in touch with its surroundings
12.A star-shaped glial cell of the central nervous system
15.a nerve that passes impulses from receptors toward or to the central nervous system
16.layer of myelin encasing (and insulating) the axons of medullated nerve fibers.
18.the thin epithelial membrane lining the ventricular system of the brain and the spinal cord. Ependyma is one of the four types of neuroglia in the central nervous system. It is involved in the production of cerebrospinal fluid (CSF).
19.A cellular system that collects information about the physical world outside the body and inside the organism.
20.the membrane potential to which a membrane must be depolarized to initiate an action potential.
21.Carrying impulses from the central nervous system to an effector.
23.Glial cells derived from mesoderm that function as macrophages (scavengers) in the central nervous system and form part of the reticuloendothelial system
25.A whitish fiber or bundle of fibers that transmits impulses of sensation to the brain or spinal cord, and impulses from these to the muscles and organs
26.The electrical potential of a neuron or other excitable cell relative to its surroundings when not stimulated or involved in passage of an impulse
Down
1.The part of the nervous system responsible for control of the bodily functions not consciously directed, such as breathing, the heartbeat, and digestive processes
2.Consists of all of the nerves in the body, outside the CNS, that carry signals from the CNS to the muscles and organs as well as signals from the body into the CNS.
4.A chemical substance that is released at the end of a nerve fiber by the arrival of a nerve impulse and, by diffusing across the synapse or junction, causes the transfer of the impulse to another nerve fiber, a muscle fiber, or some other structure
7.A specialized cell transmitting nerve impulses; a nerve cell.
8.any cell that covers the nerve fibers in the peripheral nervous system and forms the myelin sheath.
10.A gap in the myelin sheath of a nerve, between adjacent Schwann cells
11.The central structure of a neuron, which contains all of the molecular parts that keep the cell alive, generate new parts, and repair or destroy existing parts.
13.An organ or cell that acts in response to a stimulus
14.A short branched extension of a nerve cell, along which impulses received from other cells at synapses are transmitted to the cell body
17.A glial cell similar to an astrocyte but with fewer protuberances, concerned with the production of myelin in the central nervous system
22.sustentacular tissue that surrounds and supports neurons in the central nervous system
24.The long threadlike part of a nerve cell along which impulses are conducted from the cell body to other cells

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