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Anat unit 2 taste touch smell notes

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Anat unit 2 taste touch smell notes

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