Transcript The nervous system

The Nervous System
1. TURN TO PAGE 131
2. DIVIDE THE PAGE INTO 8
EQUAL BOXES
3. NUMBER THE BOXES 1-8
#1-Functions of the Nervous System
 1. Communication
and coordination
 Adapt and respond to changes from both inside and
outside the body
 2. Site of reasoning- your brain
 3. Two main divisions
 Central
nervous system (CNS): brain and spinal cord
 Peripheral nervous system (PNS)- the nerves
#2-The Neuron
 Neuron- basic of the nervous
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system
Dendrites- carry impulses
towards the cell
Axon-carry impulses away
from the cell
Myelin sheath-insulation
Synapse-space between
neurons
Neurotransmitters-chemical
messengers sent across the
synapse
#3-DCASN
 Dead
 Dendrites
 Cats
 Cell body
 Always
 Axon
 Smell
 Synapse
 Nasty
 Neurotransmitters
#4-Brain
 Cerebrum-largest part
of brain. Responsible
for reasoning,
thought, memory,
speech, sensation, etc.
 Divided into two
halves.
#4-Brain
 Cerebellum-
responsible for muscle
coordination
 Brain stem- most
basic functions;
respiration,
swallowing, blood
pressure. Lower part
(medulla oblongata) is
continuous with spinal
cord
#5-Spinal Cord
 Spinal cord- begins at
brain stem and ends at
second lumbar
vertebrae
 Contains both afferent
(to the brain) and
efferent (motor
neurons- away from
the brain)
#6-Peripheral Nervous System
 Somatic system
 Conscious control
 Reflex arc
 “Moving a hand”
 Autonomic system
 Automatic (involuntary)
 “fight or flight” response
 “heart rate goes up”
#7- Reflex Arc
1. Stimulus
3. Interneuron
2. Sensory Neuron
4. Motor Neuron
5. Impulse
#8- Today I Learned
 In 6 complete
sentences and 5 new
vocabulary words,
describe what you have
learned about the
Nervous System today.
 Highlight your words
and write neatly!