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Related Concept Videos

Physiological Control of Respiration01:23

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.
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...
Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

Understanding and evaluating diffusion and perfusion is critical in assessing a patient's respiratory and circulatory health. These processes play key roles in maintaining the body's internal environment, ensuring that tissues receive adequate oxygen while waste products are efficiently removed.
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this principle...
Gas Exchange and Transport01:20

Gas Exchange and Transport

Gas exchange, the intake of molecular oxygen (O2) from the environment and the outflow of carbon dioxide (CO2) into the environment, is necessary for cellular function. Gas exchange during respiration occurs largely via the movement of gas molecules along pressure gradients. Gas travels from areas of higher partial pressure to areas of lower partial pressure. In mammals, gas exchange occurs in the alveoli of the lungs, which are adjacent to capillaries and share a membrane with them.
Oxygen Delivering System II: Venturi Mask and Transtracheal Oxygen01:16

Oxygen Delivering System II: Venturi Mask and Transtracheal Oxygen

Oxygen therapy is a pivotal aspect of medical care, particularly for patients with respiratory ailments. Two prominent oxygen-delivering systems include the Venturi mask and the transtracheal oxygen catheter.
Venturi Mask
The Venturi mask, named after the Venturi effect, is designed to deliver precise oxygen concentrations. It consists of a large tube with an oxygen inlet that narrows down, causing a pressure drop that pulls air in through adjustable side ports. The mask is a lightweight,...
Oxygen Delivering System I: Nasal Cannula and Face Mask01:26

Oxygen Delivering System I: Nasal Cannula and Face Mask

The human body requires oxygen to function, and when the natural process of respiration is hindered, external devices, including the following, are needed to help deliver this vital gas.
Nasal Cannula
A nasal cannula is a lightweight tube split at one end into two prongs and placed in the nostrils. It is typically used to deliver low to medium levels of oxygen.
Suggested flow rate: The suggested flow rate for a nasal cannula typically ranges between 1 and 6 L/min.
Oxygen percentage setting:...
Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models00:57

Physiological Pharmacokinetic Models: Blood Flow-Limited Versus Diffusion-Limited Models

Physiological pharmacokinetic models, often called flow-limited or perfusion models, typically assume a swift drug distribution between tissue and venous blood, creating a rapid drug equilibrium. This premise is based on the idea that drug diffusion is extremely fast, and the cell membrane presents no barrier to drug permeation. In this scenario, where no drug binding occurs, the drug concentration in the tissue equals that of the venous blood leaving the tissue. This greatly simplifies the...

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Related Experiment Video

Updated: Jul 4, 2026

Fabrication and Operation of an Oxygen Insert for Adherent Cellular Cultures
11:56

Fabrication and Operation of an Oxygen Insert for Adherent Cellular Cultures

Published on: January 6, 2010

A Pressure Difference-Based Strategy for Blood Oxygen Control in Membrane Oxygenators: Reduced Modeling,

Shiwei Wang1, Shihai Chen2, Xirong Liao2

  • 1Bioengineering College, Chongqing University, No. 174, Shazheng Street, Shapingba District, Chongqing, 400044, China.

Annals of Biomedical Engineering
|July 2, 2026
PubMed
Summary

This study shows that controlling blood oxygenation in membrane oxygenators using gas-blood pressure differences is feasible. Adequate gas-to-blood flow ratios can achieve substantial oxygenation, even with ambient air.

Keywords:
Blood oxygen controlComputational simulationECMOMembrane oxygenatorPressure difference-based oxygenation control

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Design and Implementation of a Rat Ex Vivo Lung Perfusion Model

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Last Updated: Jul 4, 2026

Fabrication and Operation of an Oxygen Insert for Adherent Cellular Cultures
11:56

Fabrication and Operation of an Oxygen Insert for Adherent Cellular Cultures

Published on: January 6, 2010

Quantitative and Temporal Control of Oxygen Microenvironment at the Single Islet Level
11:49

Quantitative and Temporal Control of Oxygen Microenvironment at the Single Islet Level

Published on: November 17, 2013

Design and Implementation of a Rat Ex Vivo Lung Perfusion Model
04:38

Design and Implementation of a Rat Ex Vivo Lung Perfusion Model

Published on: May 26, 2023

Area of Science:

  • Biomedical Engineering
  • Cardiopulmonary Physiology

Background:

  • Membrane oxygenators are crucial in cardiopulmonary support.
  • Optimizing oxygenation control is essential for patient outcomes.

Purpose of the Study:

  • To investigate the regulation of blood oxygenation in membrane oxygenators by modulating the gas-blood pressure difference.
  • To assess the feasibility of pressure difference-based oxygenation control.

Main Methods:

  • Combined theoretical analysis, reduced computational simulation, and in vivo animal testing.
  • Utilized a three-compartment framework incorporating Dalton's, Fick's, and Henry's laws.
  • Developed a steady-state lumped oxygen balance model to evaluate oxygenation parameters.

Main Results:

  • Simulations indicated that outlet blood oxygen partial pressure strongly depends on gas-blood pressure difference and flow ratio.
  • Achieved simulated post-oxygenator blood oxygen partial pressure >120 mmHg with ambient air.
  • Animal experiments demonstrated a decrease in arterial oxygen partial pressure under less favorable pressure differences, particularly at higher flow ratios.

Conclusions:

  • Theoretical, simulation, and animal data support the feasibility of pressure difference-based oxygenation control in membrane oxygenators.
  • Sufficient oxygenation is achievable with ambient air if the gas-to-blood flow ratio is adequate.
  • The current model serves as a trend-level framework, requiring further validation and development for quantitative prediction.