Presentation on theme: "Sponge: Set up Cornell Notes on pg. 47"— Presentation transcript:
1Sponge: Set up Cornell Notes on pg. 47 Topic:12. 3: Sense of SmellEssential Question:Where are the olfactory receptors located?Create your own example of sensory adaptation in regards to smell.12.3 : Sense of Smell2.1 Atoms, Ions, and MoleculesTape:42- Receptor Lab 3044- HW: Diagnosing and Managing Pain Reading (Read/Highlight/?s)
2Sensory Adaptation Pg. 44 What does it mean to “adapt” to something? Sensory adaptation is the ability to ignore unimportant stimuli or “get used” toWhy is this important???If you don’t ignore it, you would be overwhelmed by unimportant informationInvolves a decreased response to a particular stimulus from the receptorsSensory impulses become less frequent and may ceaseStronger stimulus is required to trigger impulsesPg. 44
3Ex: you are probably unaware of the pressure of your clothing on your skin until it is brought to your attention
4Olfactory Organs Picture Pg.46Video NotesRelationship of Taste and SmellSlim Goodbody: Olfactory OrgansThe Chemistry of Smell2-5 bullets each!!!
5REVIEW: Special Senses Location of special senses?sensory receptors are within large, complex sensory organs in the headsmell in olfactory organs------>olfactory receptorstaste in taste buds-----> Taste cells (gustatory cells)hearing and equilibrium in ears------>hair cellssight in eyes----->Rods and cones
6Sense of Smell Olfactory Receptors chemoreceptors- respond to chemicals dissolved in liquids Similar to tasteFunction together and aid in food selection75-80% of flavor is actually the sense of smell!
8Olfactory OrgansContain:1. Olfactory receptors2. Supporting epithelial cells covered with hair-like ciliaonly nerve cells in direct contact with the outside environmentsubject to damagethe only neurons regularly replaced
10Where do you think the olfactory organs are located? Olfactory organs located high in the nasal cavity above the usual pathway of inhaled airsniffing and forcing air over receptor areas may be necessary to smell a faint odor
11Brain*Olfactory ReceptorcellsEthmoidbonePlease draw this picture on the top ½ of pg 46
13Olfactory Stimulation Olfactory receptors undergo sensory adaptation rapidlysense of smell drops by 50% within a second after stimulationwithin a minute the receptors may become insensitive to a given odor
1712. 3 Smell- Olfactory Nerve Pathways Sponge: Set up Cornell Notes on pg. 49Topic:12. 3 Smell- Olfactory Nerve PathwaysEssential 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 Pathways2.1 Atoms, Ions, and Molecules
18Olfactory Nerve Pathways Once olfactory receptors are stimulated, nerve impulses travel through…olfactory nerves olfactory bulbs olfactory tracts limbic system and olfactory cortex
19Olfactory Nerve Pathways Set up this flow map on pg. 49Olfactory Nerve PathwaysOdorant Olfactory Olfactory Olfactory Limbic OlfactoryMolecules Nerves Bulbs Tracts System Cortexpicturepicturepicturepicturepicturepicture
20Odorant MoleculesEnter nasal cavity as gasesDissolve partially in watery fluids that surround the ciliaBond to receptor proteins on ciliaStimulate olfactory receptorsGenerate nerve impulse!
28EQ: 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 moleculesOlfactory NervesOlfactory BulbsOlfactory tractsLimbic SystemOlfactory CortexPg. 48
29The Memory of my FatherAs 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 impulsesand 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).
30Let’s Share the Smelliest Story! Table Share: EVERY person must read their “Smelly Story”Choose a story that best demonstrates the olfactory nerve pathwaysClass share: Each table will share their favorite storyThe person reading the “Smelly Story” to the class does not need to be the person who wrote it