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Nervous System

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Nervous System http://www.brainpop.com/health/bodysystems/nervoussystem/ Structures of the nervous system The nervous system is made up of the brain, spinal cord and ... – PowerPoint PPT presentation

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Title: Nervous System


1
Nervous System
http//www.brainpop.com/health/bodysystems/nervous
system/
2
Structures of the nervous system
  • The nervous system is made up of the brain,
    spinal cord and nerves.
  • The central nervous system (CNS) consists of the
    brain and spinal cord.
  • The peripheral nervous system (PNS) consists of
    all nerves outside of the central nervous system.

3
Function of the nervous system
  • The nervous system functions
  • to receive information
  • respond to stimuli
  • to maintain stable internal conditions.

4
Receiving Information
  • Your nervous system makes you aware of what is
    happening in the environment around you.
  • It lets you know that a ball is zooming toward
    you, your favorite song is on the radio and that
    the pizza in your hand is hot.
  • Your nervous system also checks conditions inside
    your body, like glucose levels in your blood.

5
Responding to Stimuli
  • The nervous system responds to external stimuli
    like laughing at a funny movie.
  • The nervous system also responds to internal
    stimuli such as the bodys need for more oxygen
    by increasing the heart rate.

6
Maintaining Stable Internal Conditions
  • The nervous system helps the body to maintain
    homeostasis by directing the body to respond
    appropriately to the information it receives.
  • For example, when you are hungry your nervous
    system directs you to eat.

7
The Three Parts of the Brain are
  • Cerebrum
  • Interprets input from sense organs, controls
    voluntary movement, and is responsible for
    learning and memory.

http//www.brainpop.com/health/bodysystems/brain/
8
Cerebellum
  • Coordinates your muscle movements and helps
    you keep your balance.

9
Brainstem
  • Controls involuntary actions such as your
    heartbeat, breathing and reflexes.

10
(No Transcript)
11
  • http//www.brainpop.com/health/bodysystems/spinalc
    ord/

12
Neurons- nerve cells
  • Neurons are cells that carry information through
    your nervous system.
  • The information is carried in what is called a
    nerve impulse.

http//www.brainpop.com/health/bodysystems/neurons
/
13
Three Types of Neurons
  • Sensory Neurons
  • Pick up stimuli from internal or external
    environment and converts it to an impulse.

14
Motor Neurons
  • Send an impulse to a muscle, and the muscle
    contracts in response.

15
Interneuron
  • Located in the brain or spinal cord and carries
    the nerve impulse from one neuron to another.

16
Reflexes
  • A reflex is an automatic response that occurs
    very rapidly and without conscious control.
  • The contraction of skeletal muscles is usually
    controlled by the brain, but in reflexes the
    muscles react with the involvement of the spinal
    cord only not the brain. This protects us from
    danger.

17
  • http//faculty.washington.edu/chudler/chgames.html
  • http//faculty.washington.edu/chudler/words.html

18
Sources
  • http//www.georgiapainphysicians.com/l2_edu_pharma
    _mod1_slides.htm
  • http//www.omsusa.org/pranzatelli-Brain.htm
  • http//www.unitedstreaming.com
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