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Related Concept Videos

The Physiology of Taste01:24

The Physiology of Taste

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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...
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Gustation01:43

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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.
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Taste Buds and Receptors01:20

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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,...
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G-Protein Gated Ion Channels01:21

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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...
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G Protein-coupled Receptors01:15

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G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
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Antiepileptic Drugs: GABAergic Pathway Potentiators01:18

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γ-aminobutyric acid or GABA, plays a pivotal role as an inhibitory neurotransmitter in the brain. GABA pathway potentiators, also known as GABAergic drugs, are a class of pharmaceutical agents designed to enhance the functioning of the GABAergic system. These medications primarily treat epilepsy, a neurological disorder characterized by recurrent seizures.
The key GABA pathway potentiators used in epilepsy management are as follows.
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Related Experiment Video

Updated: Nov 18, 2025

Whole-Mount Staining, Visualization, and Analysis of Fungiform, Circumvallate, and Palate Taste Buds
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Is there a role for GABA in peripheral taste processing.

Nirupa Chaudhari1

  • 1Dept. of Physiology & Biophysics, Dept of Otolaryngology, University of Miami Miller School of Medicine, Miami, FL 33136.

Current Opinion in Physiology
|February 5, 2021
PubMed
Summary
This summary is machine-generated.

Gamma-aminobutyric acid (GABA) plays critical roles in peripheral sensory systems. This review explores GABA

Keywords:
Purinoceptorsneuromodulationneurotransmittersreceptor traffickingsensory circuitstransmitter release

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Area of Science:

  • Neuroscience
  • Sensory Biology
  • Gastroenterology

Background:

  • Gamma-aminobutyric acid (GABA) is a key inhibitory neurotransmitter in the central nervous system.
  • GABA also plays diverse roles in peripheral neurons and sensory systems, including hearing, balance, touch, and pain.
  • GABAergic signaling is known to maintain sensory receptors and afferent neurons, modulate sensory signals, and set resting neuronal excitability.

Purpose of the Study:

  • To explore the functional significance of GABAA receptors on gustatory afferent neurons.
  • To review the roles of GABA in other peripheral sensory systems.
  • To consider the potential functions of GABA signaling in the taste periphery by drawing parallels with other sensory systems.

Main Methods:

  • Literature review of GABA's roles in peripheral sensory systems.
  • Analysis of existing research on GABAA receptors in gustatory afferent neurons.
  • Comparative analysis of GABAergic functions across different sensory modalities.

Main Results:

  • GABA is essential for the maintenance of sensory receptors and afferent neurons in various peripheral systems.
  • GABA modulates sensory signals before they reach the central nervous system.
  • Tonic GABA-mediated signals establish the resting tone and excitability of peripheral afferent neurons.

Conclusions:

  • GABAA receptors are present on gustatory afferent neurons, but their function remains largely unexplored.
  • The diverse roles of GABA in other peripheral sensory systems suggest potential analogous functions in taste perception.
  • Further research is needed to elucidate the specific contributions of GABA signaling to taste transduction and processing.