1. Other Senses: Taste (Gustation) Module 9: Sensation

2. Taste Taste is a chemical sense. The receptor cells for taste are the taste buds.

3. Taste On average, adults have about 7,500 taste buds. These receptor cells are located in the tongue and in the mouth. When food dissolves on these receptors, TRANSDUCTION occurs Damaged taste receptor cells are replaced within a few days to 2 weeks

4. Taste Substances dissolved by saliva activating the taste buds (cheeks, roof of mouth, throat, tongue)

5. Taste Sensations –sweet –sour –salty –bitter

7. Time to do an Experiment Taste bud experiment Please get two q-tips and a napkin Wait for instructions Remember – no double dipping

8. Pixie Stick Dry your tongue Await for instruction

9. Supertasters People with an abundance of taste receptors Approximately 25% of the population

10. Nontasters People with a minimum of taste receptors Taste with less intensity than the rest of the population Approximately 25% of the population

11. Other Senses: Smell Module 9: Sensation

12. Other Senses:

13. Smell Olfactory cells in the upper nasal passages detect molecules in the air. Taste and smell interact to produce flavor.

14. Smell Smell is a chemical sense. Olfactory receptors/cells in the upper nasal passages detect molecules in the air. Taste and smell interact to produce flavor.

15. Olfactory Cells The chemical receptor cells for smell Located in the nasal passages

17. Smell

19. Other Senses: Touch

20. Touch Touch receptors are on the skin Four basic skin senses are –Pain, warmth, cold, and pressure All skin sensations are a combination of these four basic senses

22. Sensitivity of Diff body to PAIN Most Sensitive Back of knees Neck region Bend of elbow Least Sensitive Tip of the Nose Sole of foot Ball of thumb

23. Pain messages travel on one set of nerve fibers containing pain gates. The gates are open when pain is felt. Other sensory messages go through another set of fibers. The non-pain fibers can close the pain gates to stop the sense of pain.

24. Gate-control Theory of Pain Pain messages travel on one set of nerve fibers containing pain gates. The gates are open when pain is felt. Other sensory messages go through another set of fibers. The non-pain fibers can close the pain gates to stop the sense of pain.

25. The last sense….

26. Kinesthetic Sense The system for sensing the position and movement of individual body parts Relies on receptor cells from the muscles and joints One’s leg “falling asleep” is a disruption of the kinesthetic sense

27. Let’s Review Name the senses How many are there? Think again…

29. The senses 1.Vision 2.Hearing 3.Tasting 4.Touching 5.Smelling 6.Vestibular 7.Kinesthetic Now briefly describe what each one does

30. The End