1. Sponge: Set up Cornell Notes on pg. 47
Topic:
12. 3: Sense of Smell
Essential Question:
Where are the olfactory receptors located?
Create your own example of sensory adaptation in regards to smell.
12.3 : Sense of Smell
2.1 Atoms, Ions, and Molecules
Tape:
42- Receptor Lab 30
44- HW: Diagnosing and Managing Pain Reading (Read/Highlight/?s)

2. Sensory Adaptation Pg. 44 What does it mean to “adapt” to something?
Sensory adaptation is the ability to ignore unimportant stimuli or “get used” to
Why is this important???
If you don’t ignore it, you would be overwhelmed by unimportant information
Involves a decreased response to a particular stimulus from the receptors
Sensory impulses become less frequent and may cease
Stronger stimulus is required to trigger impulses
Pg. 44

3. Ex: you are probably unaware of the pressure of your clothing on your skin until it is brought to your attention

4. Olfactory Organs Picture
Pg.46
Video Notes
Relationship of Taste and Smell
Slim Goodbody: Olfactory Organs
The Chemistry of Smell
2-5 bullets each!!!

5. REVIEW: Special Senses
Location of special senses?
sensory receptors are within large, complex sensory organs in the head
smell in olfactory organs------>olfactory receptors
taste in taste buds-----> Taste cells (gustatory cells)
hearing and equilibrium in ears------>hair cells
sight in eyes----->Rods and cones

6. Sense of Smell Olfactory Receptors
chemoreceptors- respond to chemicals dissolved in liquids Similar to taste
Function together and aid in food selection
75-80% of flavor is actually the sense of smell!

7. Relationship of Taste and Smell (1m7s)

8. Olfactory Organs
Contain:
1. Olfactory receptors
2. Supporting epithelial cells covered with hair-like cilia
only nerve cells in direct contact with the outside environment
subject to damage
the only neurons regularly replaced

9. Slim Goodbody: Olfactory Organs (1m 26s)

10. Where do you think the olfactory organs are located?
Olfactory organs located high in the nasal cavity above the usual pathway of inhaled air
sniffing and forcing air over receptor areas may be necessary to smell a faint odor

11. Brain
*Olfactory Receptor
cells
Ethmoid
bone
Please draw this picture on the top ½ of pg 46

12. How are Taste and Smell Related?

13. Olfactory Stimulation
Olfactory receptors undergo sensory adaptation rapidly
sense of smell drops by 50% within a second after stimulation
within a minute the receptors may become insensitive to a given odor

15. Olfactory Code
Leading hypothesis-
each odor likely stimulates a distinct set of receptor cells
the brain then recognizes the particular combination as an olfactory code or particular smell

16. The Chemistry of Smell (3m1s)

17. 12. 3 Smell- Olfactory Nerve Pathways
Sponge: Set up Cornell Notes on pg. 49
Topic:
12. 3 Smell- Olfactory Nerve Pathways
Essential Question:
1. Using your Nerve Pathways Flow Map, please write a “Smelly Story”. This story could be about any odor, good or bad.
12. 3 Smell- Olfactory Nerve Pathways
2.1 Atoms, Ions, and Molecules

18. Olfactory Nerve Pathways
Once olfactory receptors are stimulated, nerve impulses travel through…
olfactory nerves olfactory bulbs olfactory tracts limbic system and olfactory cortex

19. Olfactory Nerve Pathways
Set up this flow map on pg. 49
Olfactory Nerve Pathways
Odorant Olfactory Olfactory Olfactory Limbic Olfactory
Molecules Nerves Bulbs Tracts System Cortex
picture
picture
picture
picture
picture
picture

20. Odorant Molecules
Enter nasal cavity as gases
Dissolve partially in watery fluids that surround the cilia
Bond to receptor proteins on cilia
Stimulate olfactory receptors
Generate nerve impulse!

21. Smell Receptors- Odors Magic School Bus (2m30s)

22. Olfactory Nerves
Contain sensory neurons located in the lining of the upper nasal cavity
Translate the chemical signal into the electrochemical language of the nervous system

23. Olfactory Bulbs
Extensions of cerebral cortex (brain)
Sensory impulses are analyzed and sent along to olfactory tracts

24. Olfactory Tracts
impulses travel along these tracts to cerebral centers of the brain (passageway)

25. Spilled baby powder---------> Reminds you of your child as a baby
Limbic System
Brain center for memory and emotion
Scents bring back memories
Spilled baby powder > Reminds you of your child as a baby

26. Olfactory Cortex
Located deep in the temporal lobes
Interpret the impulses
You recognize the smell!

27. Essential Oils in the E.R. (3m11s)

28. EQ: Your “Smelly Story”
Using your flow map, create a “story” based on a smell you encounter.
Remember to include a description for EACH part.
Odorant molecules
Olfactory Nerves
Olfactory Bulbs
Olfactory tracts
Limbic System
Olfactory Cortex
Pg. 48

29. The Memory of my Father
As I pass a man walking down the street, I inhale a pleasant odor in the air (Odorant molecules).
In an instant, my olfactory nerves translate this scent into a chemical signal that my nervous system can understand.
My olfactory bulbs analyze these sensory impulses
and these impulses are sent along my olfactory tract to my brain.
As the signals pass through my limbic system, I am reminded of memories of my father and I feel happy.
I realize that the man I just passed was wearing the same type of cologne that my father always wore when I was a child. (Olfactory cortex).

30. Let’s Share the Smelliest Story!
Table Share: EVERY person must read their “Smelly Story”
Choose a story that best demonstrates the olfactory nerve pathways
Class share: Each table will share their favorite story
The person reading the “Smelly Story” to the class does not need to be the person who wrote it