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NEU211 Intro to Neuro > Sense of taste (gustation) > Flashcards

Sense of taste (gustation) Flashcards

1
Q

What comes first in gustation?

A

Food chemicals must be dissolved

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2
Q

Papillae

A

Projections made up of many taste buds

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3
Q

Taste buds contain taste cells called

A

Tastants

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4
Q

Tastant cells do what two things

A
  1. Identify concentrations + quality of food
  2. Prep GI tract
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5
Q

Taste cells are specialized for

A

Sensory transduction

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6
Q

Basal cells are used for

A

taste stem cells- replaced every 10 days

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7
Q

Taste cells contain

A

Vesicles filled with NTs

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8
Q

The taste system detects 5 perceptually distinct categories of tastants. What are they?

A
  1. Salt
  2. Sour
  3. Sweet
  4. Bitter
  5. Umami
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9
Q

Salt

A

metallic ions;NaCl

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10
Q

Sour

A

H+; acidity

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11
Q

Sweet

A

Sugar/Glucose

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12
Q

Bitter

A

Alkaloid

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13
Q

Umami

A

Savory/Meaty (Glutamate)

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14
Q

Is taste segregated in different places on the tongue?

A

NO; Each taste bud contains taste cells that have receptors for multiple flavors

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15
Q

Many bitter compounds are ________________

A

Poisonous

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16
Q

The possibility of poisonous bitter compounds have a

A

Lower threshold than others

17
Q

T1 receptors bind ______; ionotropic or metabotropic

A

Things like glutamate; metabotropic

18
Q

T2 receptors bind ____________; ionotropic or metabotropic

A

Glucose/sugars; metabotropic

19
Q

T2 Membrane receptors bind _______; ionotropic or metabotropic

A

Bitter solutions; metabotropic

20
Q

ENaC membrane receptors bind ________; ionotropic or metabotropic

A

Sodium; ionotropic

21
Q

PkD2L cell receptors bind ___________; ionotropic or metabotropic

A

Sour; ionotropic

22
Q

When receptors are depolarized.

A

they release NTs

23
Q

G-proteins in T1 and T2 activate

A

an increase in concentration of IP3

24
Q

IP3 in cells increases

A

intracellular Ca2+

25
Q

An increase in intracellular Ca2+ _______________

A

Opens the TRP Ca2+ channel, depolarizing the cell

26
Q

What are the 3 major receptor nerves that innervate the tongue?

A

1.Facial nerve CN7
2. Glossopharyngeal CN9
3. Vagus CN10

27
Q

Facial nerve is in charge of what quadrant of the tongue

A

Front 2/3

28
Q

Glossopharyngeal nerve is in charge of what quadrant of the tongue

A

Back 1/3

29
Q

Vagus nerve is in charge of what quadrant of the tongue

A

Esophagus

30
Q

These three nerves synapse onto Specific parts in what part of the brain

A

Solitary nucleus in Medulla Oblaganta

31
Q

From the solitary nucleus, taste info transfers to the

A

Ventral Posteromedial nucleus (VPM)

32
Q

From the VPM, info goes into the

A

Gustatory cortex

33
Q

Where is the gustatory cortex located

A

Insula in temporal lobe

NEU211 Intro to Neuro (13 decks)

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