1. Nervous System: WOOOOHOOOO

2. Nervous System - Functions
- Collects information about the body’s internal and external environment
Regulates organs
Regulates behavior, emotion, personality
Controls sensory and motor functions
Maintains homeostasis

3. Major Components Central Nervous System (CNS)
Brain and spinal cord
Peripheral Nervous System (PNS)
Sensory neurons
Motor neurons

4. Main Parts: CNS (Central Nervous System)
Brain
Control center
Processes and relays information
Spinal Cord
Main communication
link between brain and rest of the body
31 pairs of nerves in spinal cord

5. Decision Making
Coordination of Movement

6. Main Parts-PNS Sensory Neurons
Transmit information about environment to the brain
Motor Neurons
Transmit impulse from the brain to muscles

7. Basic Unit = Neuron Dendrites Cell Body Axon Synapse
Receive electrical signal
Cell Body
Signal is then sent to this central region
Axon
The signal is carried through this to the synapse
Synapse
Junction between the axon of one neuron and the dendrites of another

8. dendrites
synapse
cell body
synapse
NEURON
axon
synapse

9. How the CNS and PNS work together:

10. Neuron Function To transmit signals from one neuron to another
Depends on electrical activity
Difference in charges of the neuron & surrounding  creates a potential
RESTING POTENTIAL
Not receiving or transmitting a signal
ACTION POTENTIAL
Receiving or transmitting a signal

11. ---electric message----
chemical
message
---electric message----

12. The Synapse: A Chemical PARTY

13. Trivia!
1. What two organs make up the central nervous system?
________________ b.______________
2. What is the difference between sensory neurons and motor neurons?
a. Sensory neurons bring impulses to the ________.
__________ neurons bring impulses to ___________.
A neuron at ________________ potential is not sending a signal.
4. What is the nature of the signal transmitted in the space BETWEEN two neurons?
A. Electrical B. Chemical C. Refractory