How the nervous System Works 15.1

Energy signals from the environmententer the nervous system and arepicked up through cells called

These messages are carriedthrough cells called

The 3 main parts of thesctypes of cells are the

and the

Impulscs lcave thecell through the

Where impulsesenter the cell

Which containsthe nucleus

the gap between eachneuron is called the

The impulsc jumpsthe gap by releasing

into it

Send impulses backto muscles

There are 3 kinds of these cells

Process the informationin the brain

lead to the brain

2 ways that the nervous system handlesinformation from the internal andexternal environment are

it through thesenses

and

or reacts to it

3 ways the brain handles theinformation is

The nervous system directs thebody to respond appropriatelyto help maintain

it

it

it

Floating Topic

Floating Topic

Changes in the environment thatcause reactions are called

Which change the informationinto electrical signals called