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Your Nervous System

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Your Nervous System Peripheral Nervous System – PowerPoint PPT presentation

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Title: Your Nervous System


1
Your Nervous System
  • Peripheral Nervous System

2
Engage
  • As a class visit IQ Test Labs at
    www.intelligencetest.com/reflex/index.htm
  • Select various students to come to the computer
    and test their skills on the different
    reflex/reaction tests. This website states that
    scientific tests have shown that reaction times
    to simple tasks have high correlations with g the
    general intelligence factor. Students should
    have fun attempting these reaction time games.

3
Explore
  • Muscle Messages

4
Explain
Section 35-3
The Nervous System
is divided into
which consists of
that make up
which is divided into
5
PNS
  • NERVES that connect the central nervous system to
    the rest of the body
  • Motor Division impulses from CNS to muscles or
    glands
  • Two Parts
  • Somatic Nervous System
  • Autonomic Nervous System
  • Sensory Division transmits impulses from sense
    organs to CNS

6
Motor DivisionPNS
7
Somatic Nervous System
  • Controls voluntary movement of the skeletal
    muscles

8
Autonomic Nervous System
  • Controls involuntary actions
  • Subdivided into two system that have opposite
    effects on the same organs
  • Parasympathetic decreases heart rate
  • Controls internal organs during normal activity
  • Sympathetic increases heart rate
  • Controls internal organs during high stress
    activity

9
Sensory DivisionPNS
10
Sensory ReceptorsWRITE INFO ON CONCEPT MAP
  • 5 categories

11
1. Pain Receptors
  • Throughout body except brain
  • Respond to chemical released by damaged cells
  • Important to recognize
  • Danger
  • Injury
  • Disease

12
2. Thermoreceptors
  • In skin, body core, hypothalamus
  • Detect variations in body temperature

13
3. Mechanoreceptors
  • Skin, skeletal muscle, and inner ears
  • Sensitive to
  • Touch
  • Pressure
  • Stretching of muscles
  • Sound
  • motion

14
4. Chemoreceptors
  • Nose and Tongue
  • Chemical in external environment

15
Figure 35-14 The Eye
Section 35-4
16
5. Photoreceptors
  • Eyes
  • Sensitive to Light
  • DO NOT WRITE NEXT INFO IT IS ON YOUR SHEET

17
Vision
  • Cornea
  • Helps focus light
  • Filled with aqueous humor
  • Iris
  • Back of cornea
  • Colored part of eye
  • Pupil
  • Tiny muscles regulate the size
  • Regulates amount of light
  • Lens
  • Small muscles change its shape to focus on object
    near and far away
  • Behind lens eye filled with vitreous humor
  • Retina
  • Has photoreceptors
  • No photoreceptors where optic nerve passes
    through the back of the eye blind spot
  • Two types
  • Rods black and white
  • Cones color

18
Pathway for Vision Reception
  • Light?
  • cornea?
  • iris and pupil?
  • lens?
  • Retina to photoreceptors?
  • Rods
  • Cones Fovea
  • Optic Nerve?
  • Brain

19
Figure 35-15 The Ear
Section 35-4
20
Hearing and Balance
  • Ear
  • Two Functions
  • Hearing
  • Detecting Positional change to movement

21
Hearing
  • Sound air vibrations
  • Auditory canal funnels air to tympanum (ear
    drum)
  • Tymapnum vibrates
  • Hammer, Anvil, Stirrup- vibrate and transmit
    vibrations to oval window
  • Cochlea filled with fluid and vibrations create
    pressure waves in the inner ear
  • Tiny hairs respond to waves and send messages to
    brain via the cochlear nerve

22
Balance
  • Semicircular Canals
  • 3 canals that form half circles
  • Filled with fluid and hairs that detect motion of
    head in relation to gravity

23
Figure 35-15 The Ear
Section 35-4
24
Smell and Taste
  • Chemoreceptors pick up chemical reception in nose
    and mouth
  • Smell olfactory bulb
  • Taste taste buds
  • Salty
  • Bitter
  • Sour
  • Sweet

25
The Senses of Smell and Taste
Section 35-4
26
Touch and Related Senses
  • Largest sense organ?
  • SKIN
  • Sensory Receptors
  • Temperature
  • Touch
  • Pain
  • Greatest density of touch receptors
  • Fingers
  • Toes
  • Face

27
Concept Map
Section 35-3
The Nervous System
is divided into
which consists of
that make up
which is divided into
28
Elaborate
  • Reflex Arc Lab
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