Download The Nervous System

An Introduction
THE NERVOUS SYSTEM
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 parts of the
body
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/Nerve%2
0impulse.html
Neuron
Neurotransmission
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?