OS III, Ex II, Taste Flashcards Preview

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Flashcards in OS III, Ex II, Taste Deck (32)
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1
Q

Where are taste receptor cells found? 4

A

Tongue surface, soft palate, pharynx and epiglottis

2
Q

Name the 4 tongue papillae

A

Filiform, fingiform, circumvillate, foliate

3
Q

Filiform

A

no taste buds, they are for touch, pain and temp

4
Q

Fungiform

A

anterior pink dots that can contain more than one taste bud

5
Q

Circumvillate

A

inverted V near back of tougue

6
Q

Foliate

A

side and posterior of tongue, they are located in trenches on side

7
Q

what is a taste bud?

A

onion shaped structures with 50-100 taste receptor cells

8
Q

what does each receptor have to respond to chemicals?

A

microvili that project through the taste pore so they can respond to chemicals

9
Q

Original concept of taste?

A

Sweet, sour, salty, bitter, and umami,

10
Q

What are the new flavors?

A

astringency, pungent, fat, starch, metallic

11
Q

How are receptor cells tuned to taste?

A

Receptors have microvili that can detect lots of flavors but a majority of them are tuned to just one.

12
Q

How are the taste regions of the toungue divided

A

now it?s the region has groups of taste buds tunned moslty to a specific taste

13
Q

who is morelikly to be a super taster?

A

women, asians, africans, southamericans.

14
Q

what causes supertasting?

A

increased number of fungiform (pink dots) papillae

15
Q

what two things do molecules interactwith to create taste?

A

1) ionchannels, 2) membrane receptors that trigger 2nd messenger

16
Q

what flavors uses ion channels

A

salty and sour

17
Q

What flavors use second messenger?

A

sweet, bitter, umami

18
Q

What can our perception of multiple tastes come from?

A

activation of multiple cell types each with different selectivly expressed receptors.

19
Q

How do taste neuros and smell neurons differ?

A

smell neurons are specific to certain scents, taste neurons are not specific and can repspond to many different taste, sweet salty etc.

20
Q

What can modulate taste reception?

A

local peptices, like Glucagon like peptide (GLP1)

21
Q

What releases glucagon like peptide?

A

Taste cells release GLP 1 and its receptor in response to food

22
Q

What tdoes GLP1 do?

A

alters responsivity to taste, makes us more sensitive to sweet and less so to umami.

23
Q

what three cranial nerves play a role in taste?

A

CN VII - Facial, CN IX - glossopharyngeal, CN X- palate and epiglottis

24
Q

where to taste neurons project to in medulla?

A

the solitary nuculeus

25
Q

Where does taste go after the solitary nucleus?

A

ipsolaterally (opposite) to thalamus (ventral posteriro medial nucleus)

26
Q

From the thalamus where does taste go?

A

to limbic cortex

27
Q

So path of taste?

A

Tongue, CN VII, IX,X, to solitary N., thalamus, libic cortex

28
Q

where is the primay taste cortex?

A

insula, between temporal and frontal lobe

29
Q

What does the insula do for taste?

A

identification and intensity, discrimative aspect of taste

30
Q

OFC received input from where ?

A

From the insula about taste and from the piraform cortex and amygdala for smel

31
Q

What is the OFC, orbitofrontal cortexes role in taste?

A

appreciation of flavor, reward, feeding corntol, integrates all sensations associated with

32
Q

What part of brain helps us decide if we are going to eat food or not?

A

orbitofrontal cortex