Download The Nervous System

TOPIC: The Nervous System
AIM: How does the Nervous
System help maintain
Homeostasis?
HW: TEXT BOOK READ
PAGES 558-562. Do
Vocabulary Definitions for
words on page 558
Background Information
Neuron = a nerve cell
Impulse = messages sent by
nerve cells
Voluntary = have conscious
control over
Involuntary = do not have
conscious control over
What is the function of the
Nervous System?
• A system that conducts
impulses to CONTROL and
COORDINATE body
activities.
Life Function associated with the Nervous
system is REGULATION.
Organization of Nervous
System
Nerves, which make up nervous
systems, are organized in the
following way…
Nervous System:
Peripheral Nervous
system
Somatic Nervous
System
Central Nervous
System
Autonomic
Nervous System
Sympathetic
Division
Parasympathetic
Division
Central Nervous System
(CNS)
What are the components of
the CNS and How do they
work together to maintain
homeostasis?
Components: Brain and Spinal Cord
Send, receive, and process
messages from the Peripheral NS
Peripheral Nervous System
(PNS)
– What are the components of
the PNS and How do they
work together to maintain
homeostasis?
Nerves that connect
the CNS with the rest
of an organism’s body.
Information Processing:
Typical Nerve Pathway
Sensory input
Integration (brain analyzes)
Motor output
Somatic Nervous System
– What are the components of the
Somatic NS and How do they work
together to maintain homeostasis?
Nerves that regulate voluntary
functions.
Autonomic Nervous System
(ANS)
What are the components of the
Automatic NS and How do they work
together to maintain homeostasis?
Nerves that control all
involuntary functions
Sympathetic Division
How does the Sympathetic
Division regulate body
activities?
• Slows down body functions
• Rest and Digest!!
Parasympathetic Division
• How does the Parasympathetic
Division regulate body activities?
By speeding up body activities
Fight or flight
Information Processing:
Typical Nerve Pathway
Sensory input
Integration (brain analyzes)
Motor output
Answer on separate sheet of
loose leaf and leave on desk
upon Exit.
How does the Nervous
system function to
maintain Homeostasis?
TOPIC: NERVOUS SYSTEM
Aim: How does a neuron
conduct an impulse?
• Do Now: Handout: Vocabulary
Map: NUERON
HW: Page 552 in Text Book Vocabulary
Definitions
General
Neuron
Axon
Dendrites
Myelin
sheath
Cyton
Synaptic
terminal
Synapse
Axon
Terminals
• YouTube - The Human Body: Nervous
System (2nd Ed., Rev.) (clip)
Vocabulary: Parts of a Neuron
• Dendrites: Receive impulses
and direct them toward the cyton.
• Cyton: Cell Body – conducts
impulses from dendrites to axon
• Axon: Transmits impulses from
cyton to terminal branches at
Synapse.
Parts continued
• Myelin Sheath: Fatty covering
on Axon that helps speed up
impulse conduction.
• Axon Terminals: Where the
axon ends and the
neurotransmitters are secreted.
THE SYNAPSE
• YouTube - Neural Synapse
The Synapse: Gap Between
neurons
The following
occurs at the
synapse:
Neurotransmitters are secreted from
axon terminals to transmit impulses
across the synapse to the dendrites of
the next neuron.
Neurotransmitters
• Chemicals secreted to transmit
impulses across a synapse.
• They have specific shapes and
only receptors of the same
shape will accept them.
Handout: Activity - Synapse
TOPIC: NERVOUS SYSTEM
AIM: How do different types of
neurons function to conduct
impulses?
Three types of neurons
1. Sensory
2. Inter or Associative
•
3. Motor
Handout for Notes
Sensory Neurons:
• Transmit impulses from your
senses into the CNS.
Where are Sensory Neurons
located? In the CNS or PNS?
Inter Neurons: Associative
between
Neurons
• Process impulses from the
sensory neurons and send
impulses to the motor neurons.
Where are Inter
neurons
located?
Motor Neurons
• Transmit impulses from the Inter
neurons to the muscles, glands, or
organs that will be producing the
response.
Where are the Motor Neurons located?
NEW VOCAB WORD: EFFECTOR
The muscles, glands, or organs producing
the response.
• YouTube - Central Nervous System,
Reflex Arc
On Loose Leaf
• Describe the path of an impulse through
the three types of neurons.
• What is the difference between a regular
reaction and a reflex?
HW: Worksheet
Review
• MovieSource: The Nervous System
TOPIC: Nervous System
AIM: How do the parts of the Brain
help maintain homeostasis?
DO Now: Worksheet
HW: STUDY FOR QUEST on
Nervous System and Midterm
Finish Flip Books
The Cerebrum
Characteristics:
* Largest part of the Brain
* Divided into hemispheres (Right & Left)
• The Cerebrum Controls all voluntary
activities.
• These include: movement, speaking and
language, memory, and senses.
The Cerebellum
Second largest part of the Brain.
The Cerebellum regulates Balance and
Coordination of movements.
The Medulla
Also known as the BRAINSTEM
It becomes continuous with the spinal cord
Regulates all Involuntary Activities such as
heart rate, breathing rate, etc.
Video Clip : The story of Phineus Gage
Phineus Gage
Nervous System Diseases and
Disorders
– Schizophrenia
– Depression
– Alzheimer’s Disease
– Parkinson’s Disease