Related Experiment Video
Updated: Jun 13, 2026
14:39
Cholinergic Ligand–dependent Modulation of Oxidative Phosphorylation Coupling in Digitonin-permeabilized BE(2)-C Neuroblastoma Cells
Published on: April 28, 2026
Degeneracy as a substrate for respiratory regulation
1Kosair Children's Hospital Research Institute, University of Louisville, 570 S. Preston Street, Baxter Building 1, Suite 304, Louisville, KY 40202, USA. nicholas.mellen@louisville.edu
Respiratory Physiology & Neurobiology
|April 24, 2010
Summary
Degeneracy, where distinct networks produce similar respiratory control, is vital for survival and adaptation. This redundancy ensures robust breathing regulation, akin to highly optimized tolerance systems.
Area of Science:
- Physiology
- Neuroscience
- Systems Biology
Background:
- Respiratory control involves complex networks with similar outputs.
- Degeneracy, the ability of distinct structures to perform similar functions, is observed in biological systems.
Purpose of the Study:
- To review the role of degeneracy in respiratory networks.
- To explain how degeneracy contributes to respiratory regulation and adaptation.
- To connect respiratory regulation to Homeostatic systems with Optimized Tolerance (HOT).
Main Methods:
- Literature review of in vivo and in vitro studies on respiratory control.
- Analysis of control theory principles applied to physiological systems.
- Conceptual framework integrating degeneracy and HOT in respiration.
Main Results:
- Degeneracy is essential for respiratory network survival during development and evolution.
- Multiple distinct respiratory networks provide a robust substrate for regulation.
- Respiratory regulation exhibits features of HOT, balancing responsiveness and stability.
Conclusions:
- Degeneracy is a fundamental principle underlying respiratory rhythmogenesis and chemosensory modulation.
- The respiratory system's adaptability and robustness stem from its degenerate nature.
- Degeneracy enables respiratory regulation that aligns with the principles of highly optimized tolerance.
Related Concept Videos
01:21Acute Respiratory Failure-II
Type I Respiratory Failure, or hypoxemic respiratory failure, occurs when the partial pressure of oxygen (PaO2) in arterial blood falls below 60 mmHg while breathing room air without a corresponding increase in arterial carbon dioxide levels (PaCO2). This condition highlights a significant impairment in the lungs' capacity to oxygenate the blood.
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
The underlying physiological abnormalities that contribute to hypoxemic respiratory failure include:
01:18Respiratory Regulation of Acid-Base Balance
Respiratory compensation is a vital physiological process that stabilizes blood plasma pH by regulating the partial pressure of carbon dioxide (PCO2), a key determinant of pH levels. Most carbon dioxide in the blood dissolves and converts into carbonic acid (H2CO3). It dissociates into hydrogen ions (H+) and bicarbonate ions (HCO3⁻). There is also an inverse relationship between PCO2 and pH.
When carbon dioxide levels increase in the blood, more H+ and HCO3⁻ are produced, leading to a...
When carbon dioxide levels increase in the blood, more H+ and HCO3⁻ are produced, leading to a...
01:30Acute Respiratory Failure-III
Hypercapnic respiratory failure, also known as Type 2 or ventilatory respiratory failure, is a severe condition characterized by the body's inability to effectively remove carbon dioxide (CO2) from the bloodstream. It leads to an arterial CO2 pressure (PaCO2) exceeding 45 mmHg and a blood pH above 7.35. This situation indicates that the body's ventilatory demand, or the ventilation needed to maintain normal PaCO2 levels, surpasses its supply or the maximum gas flow achievable without causing...
01:20Chronic Obstructive Pulmonary Disease-II: Pathophysiology
Chronic Obstructive Pulmonary Disease (COPD) pathophysiology is intricate and multifaceted, involving a complex interplay of physiological processes. Understanding these mechanisms is crucial for effectively managing and treating COPD. Here is an in-depth look at the critical elements in the pathophysiology of COPD:
Chronic Inflammation
Chronic Inflammation
01:30Alterations in Respiration II
There are numerous types of normal and abnormal respiration. Based on ventilatory movements, breathing patterns are classified as regular, deep, or shallow. Examples include Biot's breathing, Cheyne-Stokes respiration, Kussmaul's breathing, hyperventilation, and hypoventilation. Each pattern is clinically significant and aids in evaluating patients.
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes include...
In Biot's breathing, the respiratory rate and depth are irregular, alternating between periods of deep gasping and apnea. Common causes include...
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...