Related Experiment Video
Updated: Jul 9, 2026
07:02
Extracellular Multi-Unit Recording from the Olfactory Nerve of Teleosts
Published on: October 6, 2020
A computer model of mammalian central CO2 chemoreception
Mykyta Chernov1, Robert W Putnam, J C Leiter
1Dartmouth Medical School, Department of Physiology, USA. mykyta.chernov@dartmouth.edu
Advances in Experimental Medicine and Biology
|December 19, 2007
Summary
This study modeled CO2-sensitive neurons, finding that pH changes affecting potassium channels can alter neuronal activity. However, these pH shifts are not essential for neurons to respond to increased carbon dioxide.
Area of Science:
- Neuroscience
- Computational Biology
- Physiology
Background:
- Carbon dioxide (CO2) sensitivity in mammals is crucial for regulating breathing.
- The precise mechanisms underlying neuronal CO2 sensitivity are not fully understood.
- Potassium channels play a vital role in neuronal excitability and function.
Purpose of the Study:
- To investigate the role of pH-dependent potassium channel inhibition in the CO2 sensitivity of mammalian neurons.
- To develop and utilize a computational model to simulate neuronal responses to CO2.
Main Methods:
- Developed a single-compartment model of a mammalian CO2-sensitive neuron.
- Simulated the effects of intracellular and extracellular pH changes on potassium channel activity.
- Assessed neuronal activity changes in response to simulated hypercapnic conditions.
Main Results:
- pH-dependent inhibition of multiple potassium channels was sufficient to alter neuronal activity.
- Neuronal activity was affected by changes in either intracellular or extracellular pH.
- Neither intracellular nor extracellular pH changes were required for the neuronal response to hypercapnia.
Conclusions:
- pH-dependent modulation of potassium channels contributes to neuronal CO2 sensitivity.
- The model suggests a mechanism where potassium channel function is altered by pH, impacting neuronal firing.
- Further research is needed to fully elucidate the interplay between pH, ion channels, and CO2 sensing in the brain.
Related Concept Videos
01:31Chemical Factors Affecting Respiration Centers
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.
CO2 has a potent influence on respiration and is strictly regulated. Under...
CO2 has a potent influence on respiration and is strictly regulated. Under...
01:22Physiology of Respiration II: Neurogenic Control of Respiration
The neurogenic control of respiration coordinates various neural networks and pathways to regulate breathing rate and depth, meeting the body's oxygen and carbon dioxide exchange requirements. This system adapts to physiological and environmental conditions, ensuring optimal breathing patterns.
Central Control
The brainstem is the primary site of central control, hosting respiratory centers:
Central Control
The brainstem is the primary site of central control, hosting respiratory centers:
01:25Olfaction
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.
The olfactory receptors are embedded in the cilia of the...
The olfactory receptors are embedded in the cilia of the...
01:20Physiology of Smell and Olfactory Pathway
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.
The olfactory...
The olfactory...
01:21G-Protein Gated Ion Channels
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.
Sensory organs,...
Sensory organs,...
01:23Physiological Control of Respiration
Introduction
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
Regulation of Ventilation
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...
Breathing, a seemingly passive process, is regulated by the respiratory center in the brainstem. This center coordinates the involuntary control of respirations, which means it occurs without conscious effort, ensuring a smooth and uninterrupted pattern.
Regulation of Ventilation
The body maintains ventilation by monitoring levels of carbon dioxide (CO2), oxygen (O2), and hydrogen ion concentration (pH) in the arterial blood. Among these factors, the level of CO2 plays a crucial...