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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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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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Humans detect odors with the help of specialized cells located in the upper part of the nasal cavity, called olfactory receptor neurons (ORNs). ORNs possess hair-like structures called cilia, which are receptive to sensations from the inhaled air. When an odorant molecule binds to a specific receptor on the cell of the cilia, it leads to a series of events that ultimately cause the ORN to send electrical signals to the olfactory bulb in the brain through the olfactory nerves.
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Chemical factors such as changing CO2, O2, and H+ levels in arterial blood play a critical role in influencing respiration depth and rates. These variations are detected by chemoreceptors—specialized sensors located in two primary body areas. Central chemoreceptors are found throughout the brain stem, including the ventrolateral medulla, while peripheral chemoreceptors are located in the aortic arch and carotid arteries.
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Hyperventilation refers to a higher-than-normal rate and depth of breathing, often associated with anxiety attacks. This excessive breathing surpasses the body's need to expel CO2, leading to a condition known as hypocapnia - an unusually low level of carbon dioxide in the blood. Hypocapnia can constrict cerebral blood vessels, reducing blood flow to the brain, which may result in dizziness or fainting. Early signs include tingling and muscle spasms in the hands and face, caused by falling...
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The effect of high altitude on olfactory functions.

Aytuğ Altundağ1, Murat Salihoglu, Melih Çayönü

  • 1Division of Otorhinolaryngology, Istanbul Surgery Hospital, Sisli, 34365, Istanbul, Turkey, aaltundagkbb@gmail.com.

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
|November 21, 2013
PubMed
Summary

High altitude travel impairs olfactory function, reducing the ability to detect and identify odors. This study found significantly decreased smell sensitivity at 2,200 meters compared to sea level.

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Area of Science:

  • Otorhinolaryngology
  • Environmental Medicine
  • Neuroscience

Background:

  • High altitude exposure is linked to nasal congestion and altered airflow.
  • Environmental factors like barometric pressure and humidity influence olfactory perception.

Purpose of the Study:

  • To investigate olfactory function changes at high altitude in a natural environment.
  • To assess the impact of high altitude on odor threshold and identification.

Main Methods:

  • Olfactory testing using "Sniffin' Sticks" was performed on 41 healthy volunteers.
  • Testing was conducted at a high altitude of 2,200 meters and at sea level.

Main Results:

  • Odor threshold and identification scores were significantly lower at high altitude compared to sea level (p < 0.001).
  • A notable decrease in olfactory function was observed at increased altitudes.

Conclusions:

  • High altitude environments negatively affect olfactory capabilities.
  • Further research is needed to understand the mechanisms behind altitude-induced olfactory impairment.