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Factors Affecting Respiration

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Respiration is a crucial physiological function involving exchanging oxygen (O2) and carbon dioxide (CO2) between an organism and its environment. Various factors can impact this essential process:

Physiological Control of Respiration

Physiological 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.
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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...

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Physiology of Respiration I: Functions of the Respiratory System

Physiology of Respiration I: Functions of the Respiratory System

The respiratory system is crucial for exchanging oxygen (O2) and carbon dioxide (CO2) between the atmosphere and the bloodstream, maintaining the body's balance. Beyond gas exchange, it helps regulate acid-base balance, purify inhaled air, and enable vocalization.
Fundamental Processes in Respiration:

Respiration

Respiration

Overview of the Respiratory System and Energy Production
Energy production in the human body is primarily fueled by oxidation, a process where food molecules are burned by combining with oxygen to produce carbon dioxide and water. This vital metabolic process sustains life, and is supported intricately by the respiratory system.
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One key metric is the Inspiratory Capacity (IC), which represents the maximum amount of air that can be inhaled with full effort. IC is calculated by summing the tidal volume and inspiratory reserve volume, typically ranging from 2.4 to 3.6 liters.
The Functional Residual Capacity (FRC) represents the air in the...

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Related Experiment Video

Updated: Jun 7, 2026

Intraperitoneal Glucose Tolerance Test, Measurement of Lung Function, and Fixation of the Lung to Study the Impact of Obesity and Impaired Metabolism on Pulmonary Outcomes

Intraperitoneal Glucose Tolerance Test, Measurement of Lung Function, and Fixation of the Lung to Study the Impact of Obesity and Impaired Metabolism on Pulmonary Outcomes

Published on: March 15, 2018

Respiratory function and the obesity paradox.

Jordan A Guenette¹, Dennis Jensen, Denis E O'Donnell

¹Respiratory Investigation Unit, Department of Medicine, Queen's University, Kingston General Hospital, Kingston, Ontario, Canada.

Current Opinion in Clinical Nutrition and Metabolic Care

|October 27, 2010

Summary

Obesity paradoxically improves survival in chronic obstructive pulmonary disease (COPD) despite negative effects on respiratory function. Obese COPD patients show similar or better exercise tolerance, challenging previous assumptions.

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Area of Science:

Pulmonary Medicine
Respiratory Physiology
Obesity Research

Background:

Obesity negatively impacts respiratory function in general populations.
Paradoxically, obesity is linked to better survival rates in patients with chronic obstructive pulmonary disease (COPD).

Purpose of the Study:

To review the obesity paradox in COPD.
To discuss obesity's effects on respiratory function.
To explore if obesity influences COPD's natural history.

Main Methods:

Literature review and synthesis of existing research.
Analysis of physiological data concerning obesity and respiratory mechanics.
Examination of epidemiological data on COPD survival rates.

Main Results:

Obese COPD patients exhibit similar or improved dyspnea scores and exercise capacity compared to normal-weight counterparts.
Reduced operating lung volumes and higher inspiratory capacity to total lung capacity ratios may explain these findings.
Obesity does not appear to disadvantage COPD patients during exercise.

Conclusions:

Obese COPD patients are not disadvantaged during exercise.
The mechanisms underlying the improved survival associated with obesity in COPD require further investigation.