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ANATOMY
Unit 2 NOTES:
Taste, Touch,
Smell
(1) Smell
• Smell is the binding of organic molecules to
receptors deep within the nose.
• 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
Anatomy unit 2 nervous system taste touch smell notes
(2) Taste
• Taste is the binding of molecules to
receptors on tongue.
• 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
Anatomy unit 2 nervous system taste touch smell notes
(3) 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
Anatomy unit 2 nervous system taste touch smell notes
(4) Touch
• Touch = Pressure against skin
• Skin contains pressure + temperature receptors…
– Meissner’s Receptors = Super Sensitive
• Palms, Feet, Lips, Eyelids
• Minimal pressure needed
– Paccinian Receptors = Deep Receptors
• Pressure + Vibration
– Nociceptor Receptors= Sense Pain
• Most Abundant on body
– Thermoreceptors = Sense Temperature
• Individual neurons for hot and for cold
• Increase nerve impulses with changes in temperature
Anatomy unit 2 nervous system taste touch smell notes
Anatomy unit 2 nervous system taste touch smell notes

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Anatomy unit 2 nervous system taste touch smell notes

  • 2. (1) Smell • Smell is the binding of organic molecules to receptors deep within the nose. • 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
  • 4. (2) Taste • Taste is the binding of molecules to receptors on tongue. • 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
  • 6. (3) 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
  • 8. (4) Touch • Touch = Pressure against skin • Skin contains pressure + temperature receptors… – Meissner’s Receptors = Super Sensitive • Palms, Feet, Lips, Eyelids • Minimal pressure needed – Paccinian Receptors = Deep Receptors • Pressure + Vibration – Nociceptor Receptors= Sense Pain • Most Abundant on body – Thermoreceptors = Sense Temperature • Individual neurons for hot and for cold • Increase nerve impulses with changes in temperature