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Chapter 9 Vocabulary (Part 1)

Kayla Mullins

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Across
2.a type of neuroglial cell that connects neurons to blood vessels
6.stimulation level that must be exceeded to elicit a nerve impulse or a muscle contraction
7.a nerve fiber; it conducts a nerve impulse away from the neuron cell body
8.a nerve that consists of motor neuron axons
9.motor pathways of the peripheral nervous system that lead to the skin and skeletal muscles
10.the brain and spinal cord
12.nerve cells
16.a nerve composed of sensory nerve fibers
17.fatty layers formed from certain neuroglia that surround axons, providing insulation
18.portion of nerve cell that includes a cytoplasmic mass and a nucleus, and from which nerve fibers extend
19.chemicals that axons secrete on effectors (muscles or glands) or other neurons
21.specialized cells of the nervous system that produce myelin, communicate between cells, maintain the iconic environment, and nurture the differentiation of neurons
22.a neuroglial cell that supports neurons and phagocytes
23.the sequence of electrical changes that occurs in a portion of a nerve cell membrane that is exposed to a stimulus that exceeds the membrane's threshold
24.the functional connection between the axon of a neuron and the dendrite or cell body of another neuron or the membrane of another cell type
25.a type of neuroglial cell that surrounds an axon of a peripheral neuron, forming the neurilemmal sheath and myelin
26.masses of neuron cell bodies, usually outside the central nervous system
Down
1.part of the nervous system outside the central nervous system
2.part of the nervous system that controls the viscera
3.neuroglial cells that line the ventricles of the brain
4.process of a neuron that receives input fro other neurons
5.narrow gaps between schwann cells
11.specialized structures associated with the peripheral ends of sensory neurons specific to detecting a particular sensation and triggering nerve impulses in response, which are transmitted to the central nervous system
13.the difference in electrical charge between the inside and the outside of an undisturbed nerve cell membrane
14.a type of neuroglial cell that forms myelin
15.muscles or glands that efect changes in the body
20.a bundle of axons in the peripheral nervous system

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