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20 Cards in this Set

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