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