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Station 2 Nervous System
Central Nervous System and Senses
15
Science
7th Grade
03/01/2006

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Term
Homeostasis
Definition
regulation of an organisms internal, life-maintaining conditions despite changes in it's environment
Term
Neuron
Definition
basic functioning unit of the nervous sysytem, made up of a cell body dendrites, and axons
Term
Dendrite
Definition
neuron srtucture that recievs messages and sends them to the cell body
Term
Axon
Definition
neuron structure that carries messages away from the cell body
Term
Synapse
Definition
samall space across which an impulse moves from a an axon to the dendrites or cel body of another neuron
Term
Central Nervous System
Definition
division of the nervous system made up of the brain and spinal cord
Term
Peripheral Nervous System
Definition
Divison 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 memmory is stored, movments are controled, and impulses from the senses are interpreted
Term
Cerebellum
Definition
part of the brain that controls voluntary muscle movments, maintains muscle tone, and helps maintain balance
Term
Brain stem
Definition
Connects the brain to the spinal cord and is made up of the mid-brain, the pons, and the medulla
Term
Reflex
Definition
automatic, involuntary response to a stimulus; controlled by the spinal cord
Term
Retina
Definition
Light-sensetive tissue at the back of the eye contains rods and cones
Term
Cochlea
Definition
fliud filled structure in the inner ear in which sound vibrations are converted into nerve impulses that aresent to the brain
Term
Olfactory cell
Definition
nasal nerve cell that becomes stimulated by moleclues in the air and sends impulses to the brain for interpretation
Term
Taste bud
Definition
major sensory receptor on the tongue; contains taste hairs that send impulses to the brain fo interpretation
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