1. The Nervous System

2. Question???
What to brushing your teeth, riding a bike, and solving a math problem have in common??
ANSWER…. ___________________

3. ANSWER:
They all happen from instructions from your body’s “Control Center” aka your Nervous System.

4. What is the Nervous System’s Job?
It controls your thoughts and actions

5. Neurons The specialized cells that make up your nervous system.
Also called “Nerve Cells”
Can’t replace/repair themselves if they get damaged- different than all your other body cells!

6. What Does a Neuron Look Like?

7. Neurons
Their job is to carry messages to and from different parts of your body.
These messages are “weak electrical signals”
They’re more sensitive than other cells and work very quickly!!

8. Parts of the Nervous System
Brain
Spinal Cord
Many Nerves
**It is divided into 2 main sections:
-Central Nervous System- (brain and spinal cord)
-Peripheral Nervous System (nerves)

9. Central Nervous System
Includes the brain and the spinal cord
The main control center, controls your body’s actions
Brain- gets, interprets, and sends responses
Spinal Cord- bunch of nerve tissue
- organized into segments for each muscle,
organ, and function/job

10. It Controls 2 Types of Actions:
Voluntary Actions- things you choose to control (examples: like walking, smiling)
Involuntary Actions- things that you can’t control (examples: breathing, heart beat)

11. BRAIN
Mass or neurons that controls actions, emotions, thoughts, and memory.
Made up of 10 BILLION neurons
Weighs 3 lbs!!!
It’s well protected in your skull and suspended in a fluid that’s like a shock absorber

12. 3 Main Parts of the Brain:
Cerebrum- senses, thinking, speech, muscle movement
Cerebellum- balance, posture, coordination
Brain Stem- heart beat, breathing, blood pressure, digestion

14. DID YOU KNOW… Your brain is divided into 2 halves (hemispheres)
If you’re R Handed- your left side of the brain is more dominant
If you’re L Handed, your right side of the brain is more dominant
(Because the R side of your Brain, controls the L side of your body!)

15. SPINAL CORD Less than 2 feet long Well protected by your spine
Same diameter as your index finger
Relays messages from your body to the brain, and from the brain to your muscles and glands.

17. Peripheral Nervous System
Parts- all the nerves (that connect the brain’s signals to the rest of the body)
The PNS is like the mailman carrying letters to and from the post office
(carries messages to and from the brain/spinal cord)

18. 2 Main parts of the PNS
Somatic System- deals with actions you can control (VOLUNTARY)
Autonomic System- deals with actions you can’t control (auto) (INVOLUNTARY)

19. Reflexes
Involuntary or automatic action that your body does in response to something.
Protect your body from things that can harm it!
Do you know any examples???

20. Reflex Examples: Coughing when something gets in your airway
Blinking when something is in your eye to keep it out
Pulling your hand back when you touch a hot stove to keep your from getting burned

21. ACTIVITY TIME!

22. Short Video Review

23. Problems Related to the Nervous System:
Structural Disorders:
Head or Spinal Cord Injury
Degenerative Disorders:
Cerebral Palsy (CP)
Multiple Sclerosis (MS)
Infections:
Polio
Rabies,
Meningitis
GROUP ACTIVITY- pg. 296 in book!

24. Related Problems Cont’d:
The most common cause of damage to the Nervous System is what??? _______
Examples: concussion, pinched nerve, etc.
In a sporting event, someone has a head/neck/back injury. WHAT SHOULD YOU NEVER DO??!??

25. Let’s See What We Learned!
Take out a piece of paper and number it 1-

26. What are the 3 main parts that make up the Nervous System?
The Nervous System is divided into 2 main sections. What are they?
The specialized cells that make up the nervous system are called _________.
The 3 main parts of the BRAIN, that I showed you on the diagram, are called the __________, the _________, and the ________ ________.

27. 5. ________ is an automatic action that your body does in response to something.
Why do we have reflexes?
The Somatic System deals with actions you __________ control, while the Autonomic System deals with actions that you __________ control.
Most Nervous System Injuries are caused by __________.

28. Check Your Answers! The Brain, The Spinal Cord, and Nerves
2. Central & Peripheral Nervous Systems
3. Neurons
4. Cerebellum, Cerebrum, Brain Stem
5. Reflex
6. To protect us from dangers
7. CAN, CAN’T
8. Injuries