1. Now let’s talk about our other senses…

2. Our Essential Question How do we get information from our world, not using our eyes or ears?

3. Other Senses: Taste (Gustation)

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

5. Taste ~ 7,500 taste buds Food dissolves (saliva) on these receptors  TRANSDUCTION occurs Damaged taste receptor cells replaced within a few days to 2 weeks

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

8. Supertasters People with an abundance of taste receptors Approximately 25% of the population –More likely women, Asians, Africans

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

10. Other Senses: Smell

11. Smell Chemical Taste and smell interact Temporal lobe

12. Olfactory Cells The chemical receptor cells for smell Located in the nasal passages Detect molecules in air

13. Smell

14. Time to do an Experiment Please get two pack of starburst Wait for instructions What did you discover??

15. Other Senses: Touch

16. Touch Touch receptors are on the skin 4 basic skin senses –Pain, warmth, cold and pressure skin sensations = combination of these 4 basic senses Somotosensory cortex

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

18. 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 –http://www.youtube.com/watch?v=1VkwYcS Yhs4

19. Other Senses: Vestibular

20. Vestibular Sense Sense of balance and body position Receptor cells: hair cells in inner ear Motion sickness = overstimulation Parietal lobe

21. The last sense….

22. Kinesthetic Sense Sense of the position and movement of individual body parts Receptor cells in muscles and joints Your leg “falling asleep” Parietal lobe

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

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

26. How do the senses interact? Identify the physiological features common across all sensory systems.