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Related Concept Videos

The Physiology of Taste01:24

The Physiology of Taste

5.1K
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

Gustation

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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

Taste Buds and Receptors

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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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Salivary Glands and Saliva01:23

Salivary Glands and Saliva

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The salivary glands, of which there are three pairs known as the parotid, submandibular, and sublingual glands, play a crucial role in maintaining oral health and initiating the digestive process. Positioned near the ears, beneath the masseter muscle, the parotid glands secrete saliva into the oral cavity through the parotid duct of Stensen. Meanwhile, the submandibular glands, located on the floor of the mouth, secrete saliva through channels named submandibular ducts. The sublingual glands,...
1.3K
Conditioned Taste Aversion01:14

Conditioned Taste Aversion

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Conditioned taste aversion, also known as sauce béarnaise syndrome, is a phenomenon in which an individual develops an aversion to a certain food taste following a negative experience, typically illness. This form of aversion is a type of classical conditioning in which the taste of the food (conditioned stimulus, CS) is associated with the experience of illness (unconditioned stimulus, UCS).
A notable characteristic of conditioned taste aversion is that it often requires only a single...
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G-Protein Gated Ion Channels01:21

G-Protein Gated Ion Channels

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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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Related Experiment Video

Updated: Nov 2, 2025

Taste Exam: A Brief and Validated Test
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Mechanisms for the Sour Taste.

Jin Zhang1, Hojoon Lee2, Lindsey J Macpherson3

  • 1Mortimer B. Zukerman Mind Brain and Behavior Institute, Columbia University, New York, NY, USA. jz2551@columbia.edu.

Handbook of Experimental Pharmacology
|June 12, 2021
PubMed
Summary

Sour taste, mediated by acids, warns us against harmful foods. Research reveals Otopetrin1 (OTOP1) as the key sour taste receptor, detailing its pathway from tongue to brain.

Keywords:
AcidCircuitOtopetrinProdynorphinProenkephalinSomatosensorySourTasteTaste receptor

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Whole-Mount Staining, Visualization, and Analysis of Fungiform, Circumvallate, and Palate Taste Buds
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Technique to Collect Fungiform Taste Papillae from Human Tongue
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Area of Science:

  • Neuroscience
  • Sensory Biology
  • Taste Perception

Background:

  • Sour taste from acids provides crucial sensory information, protecting against ingesting unsafe foods.
  • Acids activate both taste and somatosensory neurons in mammals, eliciting disgust and pain.
  • Historically, electrical activity in taste nerves confirmed sour taste perception.

Purpose of the Study:

  • To explore the mechanisms of acid sensing in peripheral taste receptor cells.
  • To elucidate the neural circuitry transmitting sour taste information to the brain.
  • To discuss the identification of Otopetrin1 (OTOP1) as the primary sour taste receptor.

Main Methods:

  • Characterization of sour taste receptor cells.
  • Investigating the signaling pathway of sour taste.
  • Analyzing the neural circuitry involved in taste perception.

Main Results:

  • Identification of Otopetrin1 (OTOP1) as the molecular receptor responsible for sour taste.
  • Detailed mapping of the sour taste signaling pathway from the tongue to the brainstem.
  • Understanding the multifaceted roles of sour taste receptor cells within the taste bud.

Conclusions:

  • OTOP1 is the principal receptor mediating the perception of sour taste.
  • The study clarifies the peripheral and central pathways of sour taste signaling.
  • Sour taste receptor cells have diverse functions beyond detecting acidity.