Transcript Who am I? I’m…THE NERVOUS SYSTEM!

What is the Nervous
System?
 The Nervous System is a network of specialized cells called neurons that
send messages to and from the brain.
 Without your Nervous System, you could not see, hear, smell, taste, touch,
move, think, or dream! Aren’t you glad you have one?
The brain is the major
organ of the Nervous
System.
Sleeping…
ZZZZZZ…
 Without your Nervous System, you could not sleep.
 Did you know that there are five stages of sleep? They are the Twilight
Zone (I & II), Deep Sleep (III & IV), & the REM Sleep (V).
THE TWILILGHT ZONE!
 This is the stage of sleep where you’re not really
asleep yet, you’re just drifting off & can be easily
awakened.
Ever fallen asleep in class?
You were probably only in
stage I or II, the Twilight Zone.
Deep… Sleeeep…
 Your muscles are relaxed, your blood pressure and
heartbeat slow down… Stages III and IV are the stages
of sleep that is vital to our bodies.
REM Sleep
You’re in an incredibly vivid dream. You’re running in the
field with your sister. It’s so real, you think you’re actually
there. What is this? REM Sleep! REM stands for Rapid Eye
Movement. You’re brain is busy, but most of your muscles
are paralyzed when you’re in REM.
Our Brain!
 Our Brain is the main organ of the Nervous System.
 It is more advanced than today’s newest computers, and there
are still aspects of it that scientists don’t understand.
 It sends messages to the rest of your body so you can move and
talk.
What does a nerve do?
 The nerve itself is made of cells or neurons.
 The design of the nerve depends on its job.
Nerves…again!
 Nerves use electrochemical signals to send messages. (It’s like your
body’s natural electricity!)
 They also help to protect you. For example, if you’re about to fall, your
body sends a message to your brain & you are aware that you’re falling.
 The process of balance inside your body that your nerves help to restore
is called Homeostasis.
Thanks for watching!
Ba-bam!
Questions?