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Related Concept Videos

The Physiology of Taste01:24

The Physiology of Taste

The perception of a salty flavor is facilitated by sodium ions within the oral salivary fluid. Upon consumption of a salty substance, salt crystals disassemble, leading to the liberation of its constituents—Na+ and Cl- ions. These ions subsequently dissolve into the salivary fluid present in the oral cavity. The external environment of the gustatory cells experiences an elevation in Na+ concentration, thereby establishing a potent concentration gradient. This gradient propels the diffusion of...
Gustation01:43

Gustation

Gustation is a chemical sense that, along with olfaction (smell), contributes to our perception of taste. It starts with the activation of receptors by chemical compounds (tastants) dissolved in the saliva. The saliva and filiform papillae on the tongue distribute the tastants and increase their exposure to the taste receptors.
Taste Buds and Receptors01:20

Taste Buds and Receptors

Gustation, or the sense of taste, is intrinsically linked to the anatomical structures located on the tongue. This organ's surface, along with the entirety of the oral cavity, is adorned with stratified squamous epithelium. Evident on the tongue are elevated structures known as papillae (singular = papilla), which house the mechanisms for the transduction of gustatory stimuli. Four distinct types of papillae exist, each identified by their unique morphological attributes: the circumvallate,...
G-Protein Gated Ion Channels01:21

G-Protein Gated Ion Channels

GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory organs,...
The Tongue and Taste Buds00:49

The Tongue and Taste Buds

The surface of the tongue is covered with various small bumps called papillae, which either distribute what has been ingested (filiform papillae) or contain the sensory taste (or gustatory) receptor cells (fungiform, circumvallate, and foliate papillae). Embedded within each taste-related papilla are the taste buds—clusters of 30 to 100 gustatory receptor cells.
Tactile and Chemical Senses01:27

Tactile and Chemical Senses

Tactile senses encompass touch, temperature, and pain, each mediated by specific receptors. Touch receptors detect mechanical energy or pressure against the skin. Sensory fibers from these receptors enter the spinal cord and relay information to the brain stem. Here, most fibers cross over to the opposite side of the brain. The touch information then moves to the thalamus, which projects a map of the body's surface onto the somatosensory areas of the parietal lobes in the cerebral cortex. This...

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Related Experiment Video

Updated: Jun 26, 2026

Taste Exam: A Brief and Validated Test
07:10

Taste Exam: A Brief and Validated Test

Published on: August 17, 2018

Mammalian bitter taste perception.

M Behrens1, W Meyerhof

  • 1German Institute of Human Nutrition Potsdam-Rehbruecke, Arthur-Scheunert-Allee 114-116, Nuthetal, 14558, Germany. behrens@dife.de

Results and Problems in Cell Differentiation
|January 16, 2009
PubMed
Summary
This summary is machine-generated.

Mammals use bitter taste receptors to detect toxic compounds. This review covers bitter taste gene expression, signaling, and individual variations in taste perception.

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New Methods to Study Gustatory Coding
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New Methods to Study Gustatory Coding

Published on: June 29, 2017

Related Experiment Videos

Last Updated: Jun 26, 2026

Taste Exam: A Brief and Validated Test
07:10

Taste Exam: A Brief and Validated Test

Published on: August 17, 2018

Whole-Mount Staining, Visualization, and Analysis of Fungiform, Circumvallate, and Palate Taste Buds
07:40

Whole-Mount Staining, Visualization, and Analysis of Fungiform, Circumvallate, and Palate Taste Buds

Published on: February 11, 2021

New Methods to Study Gustatory Coding
10:59

New Methods to Study Gustatory Coding

Published on: June 29, 2017

Area of Science:

  • Physiology
  • Genetics
  • Biochemistry

Background:

  • Bitter taste perception in mammals involves approximately 30 bitter taste receptor genes.
  • The primary role of bitter taste is defense against ingesting toxic food metabolites.
  • Recent advancements have significantly enhanced understanding of taste receptor research, particularly for G-protein-coupled-receptor-mediated tastes like sweet, umami, and bitter.

Purpose of the Study:

  • To review current knowledge on bitter taste receptor (T2R) gene expression.
  • To summarize signal transduction pathways involved in bitter taste.
  • To explore structure-activity relationships and genetic variability of bitter taste receptors.

Main Methods:

  • Literature review of recent studies on bitter taste receptors.
  • Analysis of data on T2R gene expression patterns.
  • Examination of research on bitter taste signal transduction and protein structure.
  • Synthesis of findings on individual differences in bitter taste perception.

Main Results:

  • Bitter taste receptors exhibit diverse gene expression profiles.
  • Signal transduction mechanisms for bitter taste are complex and involve G-protein-coupled receptors.
  • Structure-activity relationships reveal specific interactions between bitter compounds and receptors.
  • Significant genetic variability exists among bitter taste receptors, leading to individual differences in taste perception.

Conclusions:

  • Bitter taste perception is a complex trait influenced by genetic and molecular factors.
  • Understanding bitter taste receptors is crucial for fields ranging from nutrition to toxicology.
  • Further research into T2R variability can elucidate individual differences in food preferences and responses to toxins.