Chapter 6 Section 1 Pages 176 180 Objective Describe the role of the nervous system Functions of the Nervous System Receives information about what is happening inside a nd outside your body ID: 785155
Download The PPT/PDF document "How the Nervous System works" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
How the Nervous System works
Chapter 6 Section 1
Pages 176 - 180
Slide2Objective: Describe the role of the nervous system
Functions of the Nervous System:
*Receives information about what is happening inside
a
nd outside your body.
*Directs the way in which your body responds to this information.
*Your Nervous System helps maintain homeostasis
Stimulus: any change or signal in the environment that
c
an make an organism react.
Slide3Response: Is what your body does in reaction to a
s
timulus.
Neurons: Cells that carry information through your
Nervous System.Nerve – Impulse: The message that a neuron carries.
(Usually an electric or chemical signal.)Dendrite: Carries impulses toward the cell body. It is a
thread-like extension of the neuron.
Axon: Carries impulses away from the cell body. There
i
s only ONE axon per neuron.
Nerve: A bundle of nerve fibers.
Slide43 Types of Neurons are found in the body…
*Sensory Neurons: Picks up stimuli from the
iinternal
o
r external environment & converts each stimulus into an impulse.
*Interneuron: Carries nerve impulses from one neuronto another. Ex. Can pass sensory impulses to motor neurons.
*Motor Neuron: Sends impulses to a muscle and the
m
uscle contracts in response.
Together these 3 types of neurons make up a chain of
n
erve cells that carry an impulse through the Nervous
System.
Slide5How a Nerve Impulse travels…
*Begins in the Dendrite
*Moves rapidly toward the cell body
*Then down the axon to the tip
Synapse: A tiny space between each axon tip and the
n
ext structure.
An impulse crosses the gap with the help of chemicals
f
rom the axon tip that help the impulse get across the
g
ap.