Gustatory System

Question 1

Taste Sensor Types

Answer 1

1. each taste bud is composed of different taste cells which are sensitive to particular ligands

• Sweet
• Umami
• Bitter
• Sour

Question 2

Sweet/Umami/Bitter Signalling

Answer 2

1. Ligand binds to a GPCR at apical membrane
2. Calcium Conc increases which triggers ATP formation
3. ATP leaves the cell and triggers 1* gustatory neurons

Question 3

Sour Signalling

Answer 3

1. Proton enters the cell
2. Calcium conc increases triggering exocytosis of nt’s
3. nt’s trigger an AP on the 1* gustatory neuron

• proton entrance depolarizes and acidifies the cell

Question 4

Gustatory Signals Cranial Nerves

Answer 4

1. Facial
2. Glossopharyngeal
3. Vagus

Question 5

G-Protein for gustatory system

Answer 5

Gustducin