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Nervous System Vocabulary
Review & Vocabulary
17
Science
Not Applicable
02/26/2005

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Term
Homeostasis
Definition
regulation of an organism's internal, life-maintaining conditions despite changes in its environment
Term
Neuron
Definition
basic functioning unit of the nervous system, made up of a cell body, dendrites, and axons
Term
Dendrite
Definition
neuron structure that receives messages and sends them to the cell body
Term
Axon
Definition
neuron structure that carries messages away from the cell body
Term
Synapse
Definition
small space across which an impulse moves from an axon to the dendrites or cell body of another neuron
Term
Central Nervous System
Definition
"(CNS) division of the nervous system, made up of the brain and spinal cord"
Term
Peripheral Nervous System
Definition
"(PNS) division of the nervous system, made up of all the nerves outside the CNS; connects the brain and spinal cord to other body parts"
Term
Cerebrum
Definition
"largest part of the brain, where memory is stored, movements are controlled, and impulses from the senses are interpreted"
Term
Cerebellum
Definition
"part of the brain that controls voluntary muscle movements, maintains muscle tone, and helps maintain balance"
Term
Brain Stem
Definition
"connects the brain to the spinal cord and is made up of the midbrain, the pons, and the medulla"
Term
Reflex
Definition
"automatic, involuntary response to a stimulus; controlled by the spinal cord"
Term
Autonomic Nervous System
Definition
controls involuntary actions
Term
Somatic Nervous System
Definition
controls voluntary actions
Term
Impulse
Definition
Any message carried by a neuron
Term
Sensory Neuron
Definition
receive information and send impulses to the brain or spinal cord
Term
Motor Neuron
Definition
conduct impulses from the brain or spinal cord to muscles or glands throughout your body
Term
Interneuron
Definition
relay impulses to motor neurons
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