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Ch. 6
Sec. 1
How the
Nervous System
Works
Functions of
the nervous
system:
1. Receives info.
2. responds to info.• Stimulus- any change or signal in environment that can make an organism react
• Response- what your body does in reaction to stimulus
3. maintains
homeostasis
neuron• nerve cell
• carries info. thru. nervous
system
carry impulses
cell body
carry impulses away
from cell body
nerve impulse•message that neuron
carries
Path of a nerve
impulse
3 kinds
of
neurons
1.
sensory
neuron
2.
interneuron
3.
motor
neuron
1.sensory neuron•picks up stimuli
nerve impulse
2. interneuron•carries nerve impulses
from neuron neuron
3. motor neuron•sends impulse to
muscle or gland
synapse• junction where 1
neuron can transfer an
impulse another
structure (neuron,
muscle, gland, etc.)
gap at a synapse = river
nerve impulse = General Lee car