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