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Related Concept Videos

Breathing01:05

Breathing

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The process of breathing, inhaling and exhaling, involves the coordinated movement of the chest wall, the lungs, and the muscles that move them. Two muscle groups with important roles in breathing are the diaphragm, located directly below the lungs, and the intercostal muscles, which lie between the ribs. When the diaphragm contracts, it moves downward, increasing the volume of the thoracic cavity and creating more room for the lungs to expand. When the intercostal muscles contract, the ribs...
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The potency and duration of action of local anesthetics (LAs) are determined by their pharmacokinetics. Pharmacokinetics describes how LAs are absorbed, distributed, metabolized, and eliminated from the body. When administered to the vascular tissues, LAs are quickly absorbed and enter the systemic circulation, reducing their localized effects. Adding vasoconstrictors such as epinephrine to LAs reduces their absorption into the systemic circulation, making them clinically effective. The...
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Inhalation anesthetics are drugs that induce general anesthesia upon inhalation. They work by increasing the sensitivity of GABAA receptors or inhibiting NMDA receptors, leading to a decrease in central nervous system activity. The depth of anesthesia can be rapidly adjusted by changing the concentration of the inhaled gas. Some common examples of inhalational anesthetics include volatile liquids like isoflurane, desflurane, sevoflurane and gases like xenon and nitrous oxide. Isoflurane, a...
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Introduction to Inspiration: The Respiratory System in Action
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Intravenous anesthetics are drugs administered parenterally to induce anesthesia or sedation. Propofol is a widely used agent formulated as a 1% emulsion in soybean oil, glycerol, and egg phosphatide. It induces rapid anesthesia primarily due to its rapid distribution from the bloodstream to target tissues and is metabolized in the liver. However, it can cause significant pain on injection and hypertriglyceridemia. Fospropofol, a water-based prodrug of propofol, lacks these adverse effects.
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Related Experiment Video

Updated: Feb 15, 2026

Simultaneous Recordings of Cortical Local Field Potentials and Electrocorticograms in Response to Nociceptive Laser Stimuli from Freely Moving Rats
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EOG responses in anesthetized freely breathing rats.

M A Chaput1

  • 1Laboratoire de Neurosciences et Systèmes Sensoriels, CNRS, ESA 5020, Université Claude Bernard, 43 Boulevard du 11 Novembre 1918, F-69622 Villeurbanne Cedex, France.

Chemical Senses
|December 13, 2000
PubMed
Summary

Mammalian olfactory responses are synchronized with breathing. The electroolfactogram (EOG) in rats reveals odor detection is linked to inhalation and exhalation phases, highlighting respiration

Area of Science:

  • Neuroscience
  • Olfactory System Function
  • Mammalian Physiology

Background:

  • Odor molecule access to olfactory receptor neurons is regulated by respiratory activity in mammals.
  • Understanding olfactory system dynamics requires considering the influence of breathing patterns.

Purpose of the Study:

  • To investigate global response characteristics of the olfactory mucosa to odor stimuli in freely breathing rats.
  • To analyze the electroolfactogram (EOG) signal's synchronization with respiration during odor exposure.

Main Methods:

  • Recording electroolfactogram (EOG) from the olfactory mucosa in anesthetized, freely breathing rats.
  • Applying odor stimuli and analyzing EOG signal patterns relative to respiratory cycles (inspiration and expiration).

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Main Results:

  • EOG responses were individual events synchronized with respiration, showing a steep decrease post-inhalation and a slower rise.
  • Responses were strongest at the onset of odor stimulation and decreased over time, but remained detectable.
  • EOG amplitude correlated with odor concentration, though less than expected, and some responses outlasted stimulation.

Conclusions:

  • Olfactory system function is significantly influenced by respiratory activity, with odor detection and signal processing synchronized to breathing phases.
  • The findings support the respiratory synchronization of neural activity in the olfactory system, emphasizing the need to incorporate respiratory patterns in olfactory research.