Biology Taste Transduction Quiz P11

Questions and Answers

What is the primary role of G-protein in Type II taste cells?

Activates intracellular pathways

Facilitates neurotransmitter release

Mediates signal transduction (correct)

Triggers cell depolarization

Which of the following is NOT a characteristic of Type III taste cells?

Involvement in various intracellular pathways

Activation by ligand binding

Release of neurotransmitters or ATP

Depolarization following ligand activation (correct)

What is the endpoint of the Ca2+ signal in Type III taste cells?

Activation of a G-protein

Initiation of action potentials in primary sensory neurons (correct)

Release of Gustducin

Cell depolarization

Which ligand types selectively activates Type II taste cells?

Bitter and umami Signup and view all the answers

What occurs after the neurotransmitter or ATP is released from Type III taste cells?

Triggers action potentials in primary sensory neurons Signup and view all the answers

Type II taste cells respond to sweet, umami, or ______ ligands.

bitter Signup and view all the answers

The G-protein involved in Type II taste cells is called ______.

Gustducin Signup and view all the answers

Type III taste cells activate various ______ pathways.

intracellular Signup and view all the answers

In Type III taste cells, the Ca2+ signal triggers ______ or ATP formation.

exocytosis Signup and view all the answers

After neurotransmitter or ATP is released from Type III taste cells, the primary sensory neuron ______ and action potentials are sent to the brain.

fires Signup and view all the answers

Study Notes

Taste Transduction Overview

Taste sensation involves Type II and Type III taste cells, each functioning through distinct mechanisms.

Type II Taste Cell

Activated by sweet, umami, or bitter ligands.
Utilizes Gustducin, a specific G-protein, for signal transduction.
Involves G protein-coupled receptors (GPCRs) to facilitate the taste signal pathway.
Depolarization of the cell occurs as part of the signaling process.

Type III Taste Cell

Ligands stimulate activation of the taste cell directly.
Engages various intracellular signaling pathways, leading to cellular responses.
The accumulation of Ca2+ in the cytoplasm is critical, triggering either exocytosis or ATP production.
Released neurotransmitters or ATP initiate action potentials in primary sensory neurons.
Sensory signals are transmitted to the brain for taste perception.

Taste Transduction Overview

Taste sensation involves Type II and Type III taste cells, each functioning through distinct mechanisms.

Type II Taste Cell

Activated by sweet, umami, or bitter ligands.
Utilizes Gustducin, a specific G-protein, for signal transduction.
Involves G protein-coupled receptors (GPCRs) to facilitate the taste signal pathway.
Depolarization of the cell occurs as part of the signaling process.

Type III Taste Cell

Ligands stimulate activation of the taste cell directly.
Engages various intracellular signaling pathways, leading to cellular responses.
The accumulation of Ca2+ in the cytoplasm is critical, triggering either exocytosis or ATP production.
Released neurotransmitters or ATP initiate action potentials in primary sensory neurons.
Sensory signals are transmitted to the brain for taste perception.

Description

Test your understanding of taste transduction mechanisms involving Type II and Type III taste cells. This quiz covers key concepts such as ligand activation, G-protein involvement, and neurotransmitter release. Explore the intricate pathways that trigger sensory responses to taste stimuli.