Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Nose tongue

3,090 views

Published on

  • Be the first to comment

  • Be the first to like this

Nose tongue

  1. 1. Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Special Senses  Objective 8  Describe the location, structure, and function of the olfactory (smell) and gustatory (taste) receptors.
  2. 2. Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Chemical Senses – Taste and Smell  Both senses use chemoreceptors  Stimulated by chemicals in solution  Taste has five types of receptors  Smell can differentiate a large range of chemicals  Both senses complement each other and respond to many of the same stimuli
  3. 3. Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Olfaction – The Sense of Smell  Olfactory receptors are in the roof of the nasal cavity  Neurons with long cilia  Chemicals must be dissolved in mucus for detection  Impulses are transmitted via the olfactory nerve  Interpretation of smells is made in the olfactory cortex
  4. 4. Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Olfactory Epithelium Figure 8.17
  5. 5. Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings The Sense of Taste  Taste buds house the receptor organs  Location of taste buds  Most are on the tongue  Soft palate  Cheeks Figure 8.18a–b
  6. 6. Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings The Tongue and Taste  The tongue is covered with projections called papillae  Filiform papillae – sharp with no taste buds  Fungifiorm papillae – rounded with taste buds  Circumvallate papillae – large papillae with taste buds  Taste buds are found on the sides of papillae
  7. 7. Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Structure of Taste Buds  Gustatory cells are the receptors  Have gustatory hairs (long microvilli)  Hairs are stimulated by chemicals dissolved in saliva
  8. 8. Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Anatomy of Taste Buds Figure 8.18
  9. 9. Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Special Senses  Objective 9  Name the FIVE basic taste sensations and list factors that modify the sense of taste.
  10. 10. Copyright © 2006 Pearson Education, Inc., publishing as Benjamin Cummings Taste Sensations  Sweet receptors  Sugars, Saccharine & Some amino acids  Sour receptors  Acids  Bitter receptors  Alkaloids (bases)  Salty receptors  Metal ions  Umami receptors  The amino acid glutamine… “beefy…savory”

×