Flashcards in Exam #6: Taste & Olfaction Deck (24):
List the five primary sensations of taste.
What substances elicit sour taste?
Acids e.g. HCl
What substances elicit salty taste?
Ionized salts i.e. NaCl
What substances elicit sweet taste?
What substances elicit bitter taste?
What substances elicit umami taste?
*Meat & cheese
What cranial nerves are involved in transmitting taste information?
Which cranial nerve innervates the anterior 2/3 of the tongue?
Which CN innervates the back of the tongue?
Which CN innervates the soft palate, the epiglottis and esophagus?
Soft palate= CN VII
Epiglottis & esophagus= CN X
How do we classify taste receptor cells? Is it a neuron?
Taste buds are specialized sensory receptor for taste transduction
How do we classify olfactory receptor cells? is it a neuron?
Olfactory receptors are bipolar neurons
What is the average life span of taste receptor cells? How does this compare to olfactory neurons?
Taste= 10 days- 2 weeks
Olfactory= ~60 days
What is the biological role of taste?
- Protection--bitter substances can stimulate protrusion of the tongue and gag
- Diet selection
- Taste aversion
What is the biological role of olfaction?
- Combine with taste to get gustatory sensation
- Pharamones for sex
What is bait-shyness?
If an animal feels sick after eating, assumption is that the novel food is responsible--animal will lose taste for the food
What is the clinical significance of bait-shyness?
This is how we lose a taste for something that has been perceived to make us sick
What is hyposmia?
Decrease sense of smell
What is anosmia?
No sense of smell
What is parosmia?
Perversion of the sense of smell
What is hypogeusia?
Less taste sensation
What is ageusia?
No taste sensation
What is parageusia?
Perversion of the sense of taste i.e. a bad taste in the mouth