1. The Nervous System

2. Nervous System Divided into: Central Nervous System (CNS)
Controls the _________
Peripheral Nervous System (PNS)
Relays ___________ b/w brain and body
body
CNS (brain and spinal cord)
PNS (Nerves of the body)
communication

3. Basic Functions of the Nervous System
Sensory
____________
Integration
Motor
Responds to signals
Maintains ______________
Gathers info
Processes info
Sensory (input from the five senses), Integration by brain or spinal cord, Motor = response
homeostasis

4. The Neuron

5. Myelination Schwann Cells (PNS)
Produce/maintains the ______________ for each axon
Myelin sheath
_________ the speed of ______________
Increase with age
myelin sheath
Increases
nerve impulses

6. CNS vs PNS http://www.youtube.com/watch?v=cGSXaWJD75U
Source of thoughts, emotions and memories

7. Table Talk
Which division of the nervous system was activated by the video clip?
Why are babies less coordinated than adults?
Their neurons are not fully myelinated
Signals are not sent as fast as in adults
This continues into teenage years

8. Structural Classification of Neurons
Determined by the # processes attached to the cell body
Process

9. How do cells communicate?
Use neurotransmitters
Neurotransmitters are released into ____________
the synapse
A synapse is the gap between an axon terminal and a dendrite.
Neurotransmitters are chemical messengers. Once released neurotransmitters are released into the synapse, they bind to a specific receptor, this elicits a response.

10. How does temperature effect neurons?
________________ the release of neurotransmitters
________________ are not firing as quickly
Cold slows down
Action potentials

11. Action Potentials

12. Action Potentials
Resting Potential
Action Potential

13. Action Potentials and Neurotransmitters
When the action potential reaches the axon terminal

14. Excitatory vs Inhibitory
action potentials
release of neurotransmitter
Inhibitory

15. Dopamine Causes feelings of euphoria Activates the pleasure center
Both excitatory (elevates mood) and inhibitory (depression)

16. Nervous System Lab Analysis
Was there a difference in the average distances between arms and fingers for the meter stick drop? Why do you think this is the case?
How many hours of sleep did you get the night before our lab? Do you think there is correlation between reaction time and amount of sleep? Explain your reasoning.
Was there a difference in average distance between neurons in the different areas tested on your body?
Which was the shortest and which was the longest? Why do you think this is the case?

17. Blind Spot Photoreceptors Optic Nerve Specialized neurons in the eye
No photoreceptors
No info to brain
Brain “makes up” missing info