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Unit 2: Nervous System

Unit 2: Nervous System. Taste & Smell & Touch. (1) Smell. Smell = chemicals binding to receptors “chemicals” = organic molecules Inside of your nose is lined with olfactory receptors… Air flows in carrying organic molecules Organic molecules dissolve in mucus lining

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Unit 2: Nervous System

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  1. Unit 2: Nervous System Taste & Smell & Touch

  2. (1) Smell • Smell = chemicals binding to receptors • “chemicals” = organic molecules • Inside of your nose is lined with olfactory receptors… • Air flows in carrying organic molecules • Organic molecules dissolve in mucus lining • Organic molecules bind to receptors • Impulse sent through Olfactory Nerve

  3. (2) Smell Memory • Smell strongly connected to emotion: • We have very detailed memories of smells • Each individual perceives smell differently… • Connected to emotional memory • Connected to receptor sensitivity • Connected to lack of memory • More often you smell it  Less often you smell it! (WHAT?! )

  4. (3) Taste • Taste = chemicals binding to receptors • “chemicals” = organic molecules • “receptors” = taste buds • Tongue is covered in papillae projections, covered in “taste buds” or gustatory cells: • Organic Molecules dissolve in saliva • Molecules bind to gustatory cells • Impulse sent to brain

  5. (4) Taste Regions on Tongue • Sweet: • Receptors bind with monosaccharides and amino acids • Location: Front & Center of Tongue • Sour: • Receptors bind with hydrogen ions (acid) • Location: Sides of Tongue • Salty: • Receptors bind with metal ions • Location: Front & Sides of Tongue • Bitter: • Receptors bind with alkaloids (typically nitrogenous) • Location: Very Back of Tongue • You can taste without smell! (That’s not what I heard!!)

  6. (5) Touch • Touch = Pressure against skin • Skin contains pressure + temperature receptors… • Meissner’s = Super Sensitive • Palms, Feet, Lips, Eyelids • Minimal pressure needed • Paccinian = Deep Receptors • Pressure + Vibration • Nociceptors = Sense Pain • Most Abundant on body • Thermoreceptors = Sense Temperature • Individual neurons for hot and for cold • Increase nerve impulses with changes in temperature

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