Transcript Nervous System

Nervous System:
WOOOOHOOOO
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
Major Components
 Central Nervous System
◦ Brain and spinal cord
 Peripheral Nervous
◦ Sensory neurons
◦ Motor neurons
(CNS)
System (PNS)
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
Decision Making
Coordination of
Movement
Main Parts-PNS

Sensory Neurons
◦ Transmit information about environment to the
brain

Motor Neurons
◦ Transmit impulse from the brain to muscles
Basic Unit =
Neuron
◦ Dendrites
 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
dendrites
synapse
cell body
synapse
NEURON
axon
synapse
How the CNS and PNS work together:
---------------PNS------------ ---------CNS------
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
---electric message---- chemical
message
---electric message----
The Synapse: A Chemical PARTY
synapse
synapse
synapse
Trivia!
1. What two organs make up the central nervous
system?
a. ________________ b.______________
2. What is the difference between sensory neurons and
motor neurons?
a. Sensory neurons bring impulses to the ________.
b. __________ neurons bring impulses to
___________.
3. 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