1. What life function does the nervous system help to carry out?

2. Nervous System
Regulation because it is the system that controls all of the activities of the body.
The nervous system is made of:
The brain
The spinal cord
The nerves
The senses

3. The nervous system also allows you to react to a stimulus.
A stimulus is a change in the environment.
Example: A hot stove
Or… tripping over a rock

4. Central Nervous System
The Central Nervous System is made of the brain and the spinal cord.

5. Peripheral Nervous System
The “Outer Nervous System” is made of the nerves and the sense organs outside of the spinal cord and brain.
Nerves
Sense organs

6. Electrical messages carried throughout the body by nerves.
Nerve Impulse
Electrical messages carried throughout the body by nerves.

7. The “funny bone” is on the elbow.
You have a nerve along your whole arm.
"Funny Bone"
The “funny bone” is the only place on the arm where the nerve is not protected.
The “funny bone” is on the elbow.

8. The Central Nervous System
* The Central Nervous System controls all of the body’s activities.
* The Central Nervous System is made of two main organs.
1. The brain
2. The spinal cord

9. The Brain
* The brain controls everything in the body.
* The brain is made of more than 10 billion nerves!
* The brain is divided into three parts and is protected by the skull.

10. The Three Parts of the Brain
* The Brain has three main parts…
1. The Cerebrum
2. The Cerebellum
3. Medulla oblongata

11. * The Cerebrum is the largest part of the brain.
1. The cerebrum controls your thinking.
2. The cerebrum controls your memory.
3. The cerebrum controls your speaking.
4. The cerebrum identifies the information gathered by your sense organs.

12. * The cerebellum is below and to the back of the cerebrum.
1. The cerebellum controls you balance.
2. The cerebellum controls your posture.
2. The cerebellum controls muscle coordination.
Cerebellum

13. The Medulla Oblongata
* The Medulla connects the brain to the spinal cord and is sometimes called the brain stem.
* The nerves in the brain stem control your heartbeat, breathing, and blood pressure.
Medulla

14. The Spinal Cord
* The spinal cord is a thick bundle of nerves that sends messages between the brain and the rest of the body.
* It connects the brain to the rest of the nervous system.
* It is surrounded by and protected by the vertebrae of your spine.
Spinal Cord

15. The Peripheral Nervous System

16. Peripheral Nervous System
* The peripheral nervous system carries messages between the central nervous system and the body.

17. Peripheral Nervous System
* The peripheral nervous system is made of the nerves and the sense organs. Everything outside of the brain and spinal cord.
Nerves
Eye
Skin
Ear
Tongue

18. * An automatic reaction that happens without thinking about it.
Reflex
* An automatic reaction that happens without thinking about it.
 When your body receives a stimulus, such as pain, it uses reflexes to protect itself. A reflex is an automatic movement that happens quickly and without thinking because the impulse never makes it to the brain. An example of an impulse is pulling your hand off a hot stove.  

19. Reflex
Upon feeling pain, the stimuli, the receptors of a sensory neuron in your skin sends a message to your spinal cord which immediately sends an impulse to a motor neuron in your muscle to cause a response. This is much faster than sending the message all the way to the brain and you never even have to think about it!

20. Impulses travel in one direction!
Neuron
One nerve cell. 1
Dendrites 2
Terminal Branches
Cell body 4
Nucleus 3
Axon
Impulses travel in one direction!

21. More than one nerve cell makes a nerve.
Synapse
More than one nerve cell makes a nerve.
A nerve impulse is an electrical impulse that travels down the nerve cell. However, the nerve cells do not touch! What chemical messenger helps the impulse jump the gap called the synapse?
Neurotransmitters

22. Malfunctions
Parkinson’s Disease
Meningitis
Stroke
Cerebral Palsy
Multiple Sclerosis