1. Chapter 35
The Nervous System

2. Question of the day
What degenerative nerve disease is named after a famous baseball player?
Lou Gehrig’s Disease
A.K.A. - ALS
Attacks nerve cells and kills them
Over time a person is unable to move

3. Ch. 35 Essential Questions
How does a Neuron work?
What is homeostasis?
What are the main parts of the brain?
How does each function?
What are the 5 senses?
How do drugs affect the nervous system?

4. 35-1 Homeostasis Humans maintain a specific condition
They keep a static internal environment
One that doesn’t change
HOMEOSTASIS
What is the same?
Body Temp

5. 35-2 Nervous System Start little Smallest piece is a NEURON
Parts of a Neuron:
Cell Body (w/Nucleus)
Axon - string to other neurons
Dendrites - fingers/ branches
Myelin Sheath - cover for axon
Terminals - branches to other neurons

6. How a Neuron transmits a signal
Need a stimulus - starts:
Sodium - Potassium Pump
Just like ETC
Na+ gets pushed out,
Creates a negative potential
Signal follows neg. potential down axon
To synapse where it transfers to another neuron

7. Neurotransmitters
Things that move a nerve impulse from 1 neuron to another

8. 35-3 Big Nervous System Central Nervous System Starts with your Brain
Includes Spinal Cord
Peripheral nerves (in appendages)

9. Parts of Your Brain Cerebrum - contains all the lobes (main part)
Cerebellum - back part
Brain Stem - spinal cord
Meninges - fluid that protects brain

10. What Each Brain Part Does
Open Website

11. 35-4 The Senses 5 Main Senses Vision Hearing & Balance Smell Taste
Touch

12. Question of the day What kind of animals see at night? Nocturnal
What part of their eye is most developed?
Rods - sensitive to light and motion
Cones - color sensitive

13. Vision Helps sense light & Color Rods Cones Parts of Eye Cornea Pupil
Lens
Retina
Optic Nerve

14. Hearing Also has to do with balance Sound waves hit Tympanum
Vibrations cause cochlear nerve to move
Sends info to Temporal Lobe for interpretation
Need to pop ears -
Clearing out Eustachian tubes

15. Smell & Taste The two are connected Smell - also called Olfactory
Helps sense 1000s of smells & tastes
Connected to your parietal lobe
Sinuses - Nose
Tongue - Mouth
Salivary Glands

16. Touch Has to do with the integumentary system Or your skin
Hair & nerves on skin sense pressure
Can feel:
Temperature
Pain
Wind or other stimulus

17. Is there a 6th sense? Synthesia
A condition where 2 senses fuse together
Gives the person rare ability to feel a different sense

18. What Drugs Do to Your Brain
STIMULANTS
Increase Blood Pressure, heart & breathing rate
Release neurotransmitters in brain
When over, user comes down off high
Cocaine, Caffeine, Amphetamines
DEPRESSANTS
Opposite of stimulants
Slows down heart, lungs, etc.
Tranquilizers, alcohol
OPIATES
Pain Relievers, like depressants
Morphine, Codeine

19. Feeling Nervous?
What makes you nervous?
How do you deal with nerves?