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the branching extensions of a neuron that receives messages and conducts impulses toward the cell body
node of ranvier
small gap between myelinated segments where axonal membrane is exposed; increase speed of impulses
the potential difference between the two sides of the membrane of a nerve cell when the cell is not conducting an impulse
change in electrical potential that occurs between the inside and outside of a nerve or muscle fiber when it is stimulated
a chemical messenger that travels across the synapse from one neuron to the next and influences whether a neuron will generate an action potential(impulse)
connects the hemispheres; found deep inside cerebrum; allows hemispheres to share information
autonomic nervous system
The part of the nervous system that controls involuntary action and responses.
a progressive disease that destroys brain cells and is identified by muscular tremors, slowing of movement, and partial facial paralysis
a disease that results in the progressive loss of an individual's memory and mental capacity.
"Lou Gherig's Disease" - progressive neurological disease in which the motor neurons degenerate to the point of total loss of motor function. The intelligence, memory, and personality is unaffected.
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