Download The Nervous System

The Nervous System
An Introduction
Standards




9a. Students know how the complementary activity of major
body systems provides cells with oxygen and nutrients and
removes toxic waste products such as carbon dioxide.
9b.Students know how the nervous system mediates
communication between different parts of the body and the
body’s interactions with the environment.
9d.Students know the functions of the nervous system and
the role of neurons in transmitting electrochemical impulses.
9e.Students know the roles of sensory neurons, interneurons,
and motor neurons in sensation, thought, and response
Objectives:



Understand the function of the
nervous system.
Explain how the nervous system
maintains homeostasis.
Explain how the nervous sends
messages and communicates with
different parts of the body.
The Nervous System
Nervous System Basics



Controls and coordinates functions
throughout the body and responds to
internal and external stimuli.
This communication helps maintain
homeostasis.
Structures-brain, spinal cord,
peripheral nerves
What is the function of
the nervous system?


Nervous system and endocrine
system-provide the means by which
organ systems communicate
This communication helps maintain
homeostasis.
Central and Peripheral
Nervous System


CNS-includes brain and spinal cord,
interprets messages from other nerves
in the body and stores some messages
for later.
PNS-network of nerves that transmits
messages to the CNS and from the
CNS to other organs in the body.
(sensory and motor system)
Central and Peripheral
Nervous System
CNS
 Made of
interneurons
 Receives, interpets,
and sends signals
to the PNS.
PNS
 Connects CNS to all
of your organ
systems
 Uses sensory
neurons to detect
stimuli
 Uses motor neurons
to carry signals
from CNS to other
The Brain
What are neurons?




Neurons=nerve cells
Neurons-stores info and carries
messages within the NS and between
other body systems.
3 types-sensory, interneurons, and
motor.
http://www.infovisual.info/03/video/Ne
rve%20impulse.html
Neuron
How are signals transmitted
in the nervous system?



Signals are sent through and between
neurons.
Signal transmission within a neuron is
electrical.
Signal transmission between neurons
is chemical.
Summary Questions




What is the function of the nervous
system?
Which organs make up the central
nervous system?
How do neurons send messages within
the nervous system?
How does the nervous system help
maintain homeostasis?