Taste

Question 1

tongue and taste cells

Answer 1

detect tastants

Question 2

salty taste receptors

Answer 2

Na+ channels are open at rest (but there is no net movement). Na flows in. Depolarizes membrane. Voltage gated Na+ channels amplify depolarization. Voltage gatedCa+ channels allow Ca+ to enter. NT released.

Question 3

sour taste receptors

Answer 3

acids have protons. thus, protons depolarize the membrane for sour tastes through a channel. Voltage gated Na+ channels amplify depolarization. Voltage gated Ca+ channels allow Ca+ to enter. NT released.

Question 4

bitter, sweet, and umami receptors

Answer 4

Bitter: the T2Rs (30 types). Sweet: T1R2 + T1R3. Umami: T1R1 + T1R3. All function through G protein coupled receptors that activate Phospholipase C which turns PIP2 into IP3. IP3 enhances Ca+ release from storage and causes Na+ to enter cell through Voltage gated channels. Depolarization. Additional Ca+ comes in through channels. NT release.

Question 5

population coding

Answer 5

used to code for tastant. because each cell responds to multiple tastants, need to look across a popultation of cells to determine the tastant

Question 6

information about taste goes to

Answer 6

the primary gustatory cortex and stays ipsilateral