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20 Cards in this Set
- Front
- Back
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recieves and relays information about activities within the body and maintains and responds to internal and external changes
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nervous system
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cell that carries impulses throughout the nervous system
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neuron
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message carried by the nervous system that takes the form of an electrical signal
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impulse
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neuron that carries impulses from the sense organs to the brain and spinal chord
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sensory neuron
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neuron that carries impulses from the brain and spinal chord to muscles and gland
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motor neuron
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cell that connects sensory and motor neurons and carries impulses between them
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interneuron
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part of a neuron that contains the nucleus and much of the cytoplasm
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cell body
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extension from the cell body of a neuron that carries impulses from the enviornment toward the cell body
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dendrite
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long fiber that carries impulses away from the cell body of a neuron
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axon
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small swelling in a neuron at the end of an axon
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axon terminal
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difference in charge across a nerve cell membrane resulting from the negative charge on the inside and the positive charge on the outside
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resting potential
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changes in membrane potential that caracterize a nerve impulse; essentially the depolerazation and repolerazation of a neuron
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action potential
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substance composed of lipids and protein that forms an insulated sheath around the axon
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myelin
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minimum level of a stimulus required to activate a neuron
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threshold
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special sensory neuron in a sense organ that recieves stimuli from the external enviornment
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receptor
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muscle or gland that bring about a coordinate response to a stimulus
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effector
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point of contact of which an impulse is passed from one cell to another
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synapse
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substance used by one neuron to signal another
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neurotransmitter
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division of the nervous system that consists of the brain and the spinal chord
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central nervous system
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division of the nervous system tha tlies outside the central nervous system and contains the cranial and spinal nerves and ganglia
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peripheral nervous system
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