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Related Concept Videos

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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Olfactory Receptors: Location and Structure01:03

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The process of olfaction, also known as the sense of smell, is a sophisticated chemical response system. The specialized sensory neurons that facilitate this process, known as olfactory receptor neurons, are situated in an upper segment of the nasal cavity, known as the olfactory epithelium. Olfactory sensory neurons are bipolar, with their dendrites extending from the epithelium's apex into the mucus that lines the nasal cavity. Airborne molecules, when inhaled, traverse the olfactory...
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Primary Motives: Hunger and Thirst01:25

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Hunger and thirst are fundamental physiological drives crucial for maintaining homeostasis and ensuring the survival of both humans and animals. These drives are regulated through complex interactions between the brain, hormones, and sensory receptors.
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The Physiology of Taste01:24

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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

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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Regulation of Food Intake01:30

Regulation of Food Intake

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Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
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Related Experiment Video

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Hyponeophagia: A Measure of Anxiety in the Mouse
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Hunger state affects both olfactory abilities and gustatory sensitivity.

Deniz Hanci1, Huseyin Altun2,3

  • 1ENT Clinic, Okmeydanı Research and Education Hospital, Istanbul, Turkey.

European Archives of Oto-Rhino-Laryngology : Official Journal of the European Federation of Oto-Rhino-Laryngological Societies (EUFOS) : Affiliated with the German Society for Oto-Rhino-Laryngology - Head and Neck Surgery
|March 7, 2015
PubMed
Summary

Human senses of smell and taste change with hunger and satiety. This study found reduced olfaction and altered taste sensitivity depending on the body's energy state, impacting flavor perception.

Keywords:
Extended Sniffin’ testGustationHungerSatietySmellTaste

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Related Experiment Videos

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Area of Science:

  • Neuroscience
  • Sensory Science
  • Human Physiology

Background:

  • Chemical senses (odor, taste, appearance) influence appetite.
  • Understanding appetite-flavor links is crucial due to rising obesity rates.
  • Existing research on olfactory and gustatory changes lacks standardized methods, yielding inconsistent results.

Purpose of the Study:

  • To investigate the impact of hunger and satiety on olfactory abilities and gustatory sensitivity.
  • To establish a clearer relationship between sensory perception and the body's nutritional status.
  • To address inconsistencies in previous research by using standardized testing.

Main Methods:

  • 123 subjects (37 men, 86 women) participated.
  • Standardized Sniffin' Sticks Extended Test for olfaction and Taste Strips for gustation were employed.
  • Blood glucose levels confirmed hunger and satiety states.

Main Results:

  • Olfactory abilities significantly decreased in a satiety state compared to a hunger state (mean TDI 39.3 vs. 37.4, p < 0.001).
  • Gustatory sensitivity was significantly higher for sweet, sour, and salty tastes in hunger (p < 0.001).
  • Sensitivity to bitter tastants was significantly higher in satiety (p < 0.001).

Conclusions:

  • Both olfactory and gustatory sensitivities are significantly affected by the hunger state.
  • This study provides novel insights into the interplay between nutritional status and sensory perception.
  • Findings contribute to a better understanding of appetite regulation and flavor perception in humans.