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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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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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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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Peripheral thermosensation is the perception of external temperature. A change in temperature (on the surface of the skin and other tissues) is detected by a family of temperature-sensitive ion channels called Transient Receptor Potential, or TRP, receptors. These receptors are located on free nerve endings. Those detecting cold temperatures are closer to the surface of the skin than the nerve endings detecting warmth. These thermoTRP channels, while temperature selective, have relatively...
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The somatosensory system is the central and peripheral nervous system component that senses and processes touch, pressure, pain, temperature, and body position or proprioception. The process of sensation takes place at three levels:
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Sensory receptors play an integral part in comprehending our external and internal environments. They receive diverse stimuli, converting them into the nervous system's electrochemical signals. This conversion occurs as the stimulus alters the sensory neuron's cell membrane potential, instigating the generation of an action potential. This action potential is subsequently transmitted to the central nervous system (CNS), which integrates with other sensory data or higher cognitive...
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New Methods to Study Gustatory Coding
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Peripheral coding of taste.

Emily R Liman1, Yali V Zhang2, Craig Montell3

  • 1Section of Neurobiology, University of Southern California, Los Angeles, CA 90089, USA.

Neuron
|March 11, 2014
PubMed
Summary
This summary is machine-generated.

Animals share basic taste qualities like sweet and bitter, crucial for survival. However, the underlying taste receptors and signaling pathways differ significantly between species like fruit flies and humans.

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Area of Science:

  • * Gustatory Systems
  • * Comparative Biology
  • * Molecular Biology

Background:

  • * Five canonical tastes (bitter, sweet, umami, salty, sour) are conserved across diverse species, from fruit flies to humans.
  • * This conservation reflects fundamental biological drives for nutrient consumption and toxin avoidance.
  • * Despite conserved taste qualities, the molecular mechanisms (receptors, signaling) mediating taste are highly divergent between vertebrates and invertebrates.

Purpose of the Study:

  • * To review recent advancements in taste research, focusing on mammalian and fly models.
  • * To highlight common principles in gustatory system function across species.
  • * To explore the divergence in taste receptor types and signaling mechanisms.

Main Methods:

  • * Review of recent scientific literature on taste transduction and coding.
  • * Comparative analysis of gustatory systems in mammals and invertebrates (specifically flies).
  • * Focus on molecular identification of taste receptors and signaling pathways.

Main Results:

  • * Significant progress in identifying taste receptors and signaling molecules over the past two decades.
  • * Stunning advances in understanding taste transduction and information coding in gustatory systems.
  • * Identification of common functional principles despite distinct molecular underpinnings.

Conclusions:

  • * Gustatory systems exhibit remarkable functional conservation of basic taste perception.
  • * Molecular mechanisms for taste detection are highly divergent between major animal groups.
  • * Continued research reveals shared principles in taste information processing across species.