1. The Nervous System

2. Nervous System Two Subdivisions Central Nervous System (CNS)
Brain
Spinal cord
Peripheral Nervous System (PNS)
Nerves of the body

3. Central Nervous System
Sensory info
Source of:
Thoughts
Emotions
Memories

4. Subdivisions of the PNS
Somatic Nervous System
Skeletal Muscles
All senses except touch
Voluntary
Autonomic Nervous System
Organs (except skeletal muscle)
Involuntary

5. Continued Enteric Nervous System “Brain of the gut” GI tract
Involuntary

7. Sympathetic vs Parasympathetic
Branches of the ANS
Have opposing actions
Symp – increase HR
Para- decreased HR
Sympathetic
“Fight or Flight”
Parasympathetic
“Rest and Digest”

8. Brainpop Terms Neuron Stimulate Neurotransmitter Autonomic Somatic
Reflex
Provide examples of autonomic and somatic examples : )

9. Reaction Time Lab Analysis
Which division(s) of the nervous system were working during lab? What leads you to think this?
Was there a difference in the average distances between arms and fingers for the meter stick drop? Explain why.
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.

10. Basic Functions of the Nervous System
Sensory
Gathers info
Integration
Process Info
Motor
Responds to signals
Maintains homeostasis

11. What is nervous tissue made up of?
Neurons
Functioning unit
Neuroglia
Support unit

12. Neuron Brainpop again!! Synapse Dendrite Soma Nerve
Describe how the body is able to send messages

13. Neuroglia Multiply or divide in mature NS Schwann Cells (PNS)
E.x Injury or disease
Schwann Cells (PNS)
Produce/maintain the myelin sheath for a single axon

14. Organization of the NS (Figure 9.1)
Nerves
Ganglia
Enteric Plexuses
Sensory Receptors

15. Cell to cell Communication
Done at a synapse
What is a synapse?
Neurotransmitters are released
What are neurotransmitters?
Describe the process of cell to cell communication

16. Blind Spot What are photoreceptors? Optic Nerve
Specialized neurons in the eye
Optic Nerve
No photoreceptors
No info to brain
Brain “makes up” missing info

17. Action Potentials

18. Action Potentials
Which conditions exist inside and outside of a cell during resting potential?
When does an action potential occur? How is this achieved?

19. Action Potentials and Neurotransmitters
What happens when the action potential reaches the axon terminal?

20. Food and Mood Do you think that certain food can alter your mood?
Do you think that people can become physically addicted to certain foods?
After reading the article, would you change your eating habits? Why or why not?