Download Nervous System Peripheral Nervous System

Mr. Gibbons
7R Integrated Science
Name_________________________
Date___________________per____
The Nervous System
The control center of your body
Nervous System:
Body system that controls the actions of an animal and sends
signals (impulses) to every part of the body
System overview:
(simplified)
Purpose?
 Coordinates all of the _________________________ which
controls EVERY activity done
 Provides a way to send messages (impulses) to all parts of the body
from the brain
 Stores ________________ and allows for __________________
 Maintains ________________________
Reminder:
This system functions using a quick STIMULUS  RESPONSE method
The Organs:
The Picture:
Central Nervous
System
(CNS)
Brain (A)
&
Spinal Cord (B)
Peripheral Nervous
System
(PNS)
Nerves (C)
Note:
The average human brain is about 3.0 pounds and contains about
100.0 BILLION neurons (nerve cells)
Two parts of the nervous system:
Nervous
System
Central Nervous
System:
1.
Peripheral Nervous
System:
Central Nervous System (CNS)Control center of the nervous system controlling
both voluntary and involuntary actions
Voluntary –
Anything you control and think about doing
Ex:
speaking, running, karate chopping
Involuntary –
Anything you don’t control and don’t have to think about
Ex:
digestion, heartbeat, reflexes
A.
The Brain:
Large mass of neurons (nerve cells) located in the head
Protected by the:
B.
Spinal cord:
Bundle of nerves in charge of __________________________
Protected by the:
2.
Peripheral Nervous System (PNS)All of the ___________________ outside of
the central nervous system.
The Nervous System Song
lyrics by: Mr. Parr
Each neuron has a cell body, a nucleus
Strands called nerve fibers
There are two types them
Carrying information out-in
When info's channeled to the cell body-Dendrites
When it is sent away from-axons
They pair up from one cell to a friend
To pass on the instructions
Chorus:
There are millions of nerves
They are called neurons
And there are just three types
Sensory is the first has receptors
They respond to stimuli
Association's in brain and spinal cord
Interpreting the info and passing on
To move the motor neurons carry to the body
Bring it to the glands
Bring it to the muscles...oh oh oh oh oh
Nervous System
Spinal cord, brain, and nerves... oh oh oh oh oh
The Nervous System
Nerves are chords that come in packs
Of nerve fibers
Sensory, motor, or mixed nerves
The spinal chord's a thick bundle runs from the brain
Through holes in the backbone
Info travels through electric signals nerve impulse
Neurotransmitter's released at the junction
If enough of the chemical builds up
In the next neuron
Impulse is sent on
Chorus:
There are two main types of actions, actions
Carried out your body, body
Voluntary actions, actions
Consciously in your mind, mind
If you do something, something
That is automatic, (that is automatic)
Involuntary action, (involuntary action)
Like digestion, breathing
Involuntary
Reflex actions are sudden movements
Chorus:
Everybody in the world, Let me here you sing it like
The Nervous System (spoken)
Neurons
Definition:
Other Vocabulary:
Impulse –
Electrical signal that travels through the nervous system
Synapse–
The space between neurons. Chemicals must be used to cross the gap
.
Neuron Parts
1
Dendrites
Cell Body
Carries impulses
_______________ the cell body
Core of the cell containing the
_________________
Axon
“Wire” that carries impulses
_______________ the cell body
Myelin
Sheath
Terminal
Branches
2
Fat covering the axon which
helps to ___________________
Releases chemicals in order to
pass on the impulse
Chemical that travels over the
_________________
3
4
5
6
The Reflex Arc
It’s a no-brainer!
Hey, what
about me?
1.
Sensory organ is stimulated by some
stimulus
2.
The impulse is sent to the spine to be
processed
3.
An impulse is sent to muscle starting a
response (reaction)