1. Chapter 6 Safeguarding Your Senses

2. © Copyright 2005 Delmar Learning, a division of Thomson Learning, Inc.
Chapter Objectives
List and describe the senses
Describe the structures and functions of the eye
Describe activities that increase the risk for eye damage
Describe the structures of the ear
Explain how hearing works
(continues)
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3. Chapter Objectives (continued)
Explain why taste and smell work together
Discuss the condition of synesthesia
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4. © Copyright 2005 Delmar Learning, a division of Thomson Learning, Inc.
Introduction
Your senses add pleasure to your life
Senses contribute to your safety by providing warnings of danger
Senses consist of a complex system of special structures and nerves that connect with the brain
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5. © Copyright 2005 Delmar Learning, a division of Thomson Learning, Inc.
Sense you depend on most
Structure of the eye
Cornea
Iris
Lens
Retina – rods and cones
Optic nerve
Pathway of vision
Power of accommodation
Caring for your eyes
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6. © Copyright 2005 Delmar Learning, a division of Thomson Learning, Inc.
Hearing
Structure of the ear
Outer ear
Middle ear
Inner ear
Pathway of hearing
Sound
Caring for your ears
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7. © Copyright 2005 Delmar Learning, a division of Thomson Learning, Inc.
Touch
Different types of receptors in the skin pick up sensations and send signals to the brain
Pressure
Vibration
Temperature
Pain
Caring for touch sensors
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8. © Copyright 2005 Delmar Learning, a division of Thomson Learning, Inc.
Smell
Receptors stimulated by chemicals
Olfactory area in nasal passage detects odors
Information transferred to brain for interpretation
Closely linked to taste
Protects you from rotten food
Caring for olfactory structures
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9. © Copyright 2005 Delmar Learning, a division of Thomson Learning, Inc.
Taste
Taste buds in tongue are stimulated by chemicals
Tongue can detect five flavors
1. Sweet
2. Sour
3. Bitter
4. Salty
5. Beefy
Caring for taste buds
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10. © Copyright 2005 Delmar Learning, a division of Thomson Learning, Inc.
Synesthesia
Rare hereditary condition
“Joined sensation” or “sixth sense”
Sensual stimulus experienced by more than one sense
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11. © Copyright 2005 Delmar Learning, a division of Thomson Learning, Inc.
Summary
Your senses add to your enjoyment of the world
Your senses also protect you from danger
It is important not to take senses for granted
Take care of the structures that provide your sensory contacts
© Copyright 2005 Delmar Learning, a division of Thomson Learning, Inc.