Chapter 6 Safeguarding Your Senses

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Presentation transcript:

Chapter 6 Safeguarding Your Senses

© 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) © Copyright 2005 Delmar Learning, a division of Thomson Learning, Inc.

Chapter Objectives (continued) Explain why taste and smell work together Discuss the condition of synesthesia © Copyright 2005 Delmar Learning, a division of Thomson Learning, Inc.

© 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 © Copyright 2005 Delmar Learning, a division of Thomson Learning, Inc.

© 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 © Copyright 2005 Delmar Learning, a division of Thomson Learning, Inc.

© 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 © Copyright 2005 Delmar Learning, a division of Thomson Learning, Inc.

© 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 © Copyright 2005 Delmar Learning, a division of Thomson Learning, Inc.

© 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 © Copyright 2005 Delmar Learning, a division of Thomson Learning, Inc.

© 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 © Copyright 2005 Delmar Learning, a division of Thomson Learning, Inc.

© 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 © Copyright 2005 Delmar Learning, a division of Thomson Learning, Inc.

© 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.