8th grade ch. 6 sec. 1 nervous system
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Ch. 6Sec. 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 kindsof
neurons
1.sensoryneuron
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 = rivernerve impulse = General Lee car
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