Sense of Taste and Smell (PowerPoint)

Document Sample
Sense of Taste and Smell (PowerPoint) Powered By Docstoc
					Sense of Taste and

     Meagan MacGregor
      Amanda Kurkjian
        Paige Swank
       Danielle Greco
      Susan Loschiavo
 Receptors for olfaction
and the olfactory pathway
Olfaction- roof of the two nasal cavities in the
  human nose

Olfactory Pathway- the neuronal cells form
  axons are bundled in groups 10-100 to
  penetrate the ethmoidal cribri-form plate of
  bone reaching the olfactory bulb in the brain
     Olfactory Receptors
Location- occupy a stamp-sized area in the roof
  of each nasal activity
     Olfactory Receptors

Structure- neurons equipped with olfactory
  hairs, long cilia protrude from the nasal
  epithelium and are continuously bathed by a
  layer of mucus secreted by underlying glands
     Olfactory Receptors

Functions- Give you a sense of smell and allow
  you to adapt quickly when exposed to an
  unchanging stimulus.
  Receptors for gustation
  and gustatory pathway
Gustatory- epithelial cells that respond to the
 chemicals that dissolve in saliva. They have
 gustatory hairs that poke through the taste

Gustatory Pathway- occur from epithelial cells
 and are located on taste buds in the papillae
 of the tongue. Detect different tastes with a
 unique chemosensory mechanism
        Taste Receptors

Location- widely scattered in the oral cavity of
  the 10,000 or more taste receptors, most are
  on the tongue. Some are scattered on the soft
  palate and inner surface of the cheeks. Found
  on the round circumvallated papillae and on
  the tops of fungi form papillae.
         Taste Receptors

Structure- small peg-like projections, or papillae
         Taste Receptors
Function- The five major types of taste buds
  respond to stimulation of the five major taste
  sensations; sweet receptors, salty receptors,
  sour receptors, bitter receptors, and umami.
     Four Basic taste
  sensations and factors

#1: Sweet Receptors- respond to sugars,
  saccharine, some amino acids and some lead
      Four Basic taste
   sensations and factors

#2: Salty Receptors- respond to metal ions in
      Four Basic taste
   sensations and factors

#3: The Sour Receptors- respond to hydrogen
  ions or the acidity of the solution
      Four Basic taste
   sensations and factors

#4: The Bitter Receptors- respond to alkaloids

Shared By: