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Related Concept Videos

Olfaction01:25

Olfaction

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The sense of smell is achieved through the activities of the olfactory system. It starts when an airborne odorant enters the nasal cavity and reaches olfactory epithelium (OE). The OE is protected by a thin layer of mucus, which also serves the purpose of dissolving more complex compounds into simpler chemical odorants. The size of the OE and the density of sensory neurons varies among species; in humans, the OE is only about 9-10 cm2.
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Tactile and Chemical Senses01:27

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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.
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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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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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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.
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Introduction to Special Senses01:26

Introduction to Special Senses

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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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Related Experiment Video

Updated: Jan 12, 2026

Automated Multimodal Stimulation and Simultaneous Neuronal Recording from Multiple Small Organisms
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Coding of chemosensory stimulus mixtures.

D G Laing1

  • 1CSIRO Division of Food Research, Food Research Laboratory, North Ryde, N.S.W., Australia 2113.

Annals of the New York Academy of Sciences
|January 1, 1987
PubMed
Summary

Peripheral olfactory structures process odor mixtures through mucus adsorption and odorant diffusion. These mechanisms explain odor suppression and masking, guiding future research on molecular properties.

Area of Science:

  • Olfactory neuroscience
  • Sensory processing
  • Chemoreception

Background:

  • The olfactory system processes complex odor mixtures, but the mechanisms are not fully understood.
  • Peripheral olfactory structures are hypothesized to play a significant role in initial odor mixture processing.

Purpose of the Study:

  • To investigate the roles of differential adsorption and diffusion in the olfactory mucus in processing odor mixtures.
  • To determine how these peripheral processes contribute to phenomena like odor suppression and masking.

Main Methods:

  • Analysis of physiological and psychophysical data related to odorant interactions.
  • Examination of the sequential steps of odorant adsorption, diffusion, and neuronal activation within the olfactory mucus.

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Main Results:

  • Odor mixture processing involves at least two peripheral steps: differential adsorption by olfactory mucus and diffusion through the mucus to activate receptor neurons.
  • Adsorption separates and concentrates odorants, while diffusion times vary significantly between odorants and are concentration-dependent, further separating their actions.
  • These peripheral processes can individually or collectively account for observed mixture phenomena like suppression and masking.

Conclusions:

  • Peripheral olfactory structures perform substantial processing of odor mixtures.
  • Differential adsorption and diffusion within the olfactory mucus are key mechanisms for separating odorant actions and explaining mixture effects.
  • Future studies should focus on defining the specific roles of these processes using odorants with varying molecular properties.