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Gas Exchange and Transport

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.

Assessment of Diffusion and Perfusion

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
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Oxygen Transport in the Blood

Oxygen Transport in the Blood

Hemoglobin (Hb) is a crucial molecule in the human body, consisting of four polypeptide chains, each bound to an iron-containing heme group. This unique structure enables hemoglobin to bind to oxygen, with each molecule capable of combining with four molecules of oxygen, leading to rapid and reversible oxygen loading. When fully loaded with oxygen, it is called oxyhemoglobin, while hemoglobin that has released oxygen is called reduced hemoglobin or deoxyhemoglobin. As hemoglobin binds oxygen,...

Oxygen Delivering System I: Nasal Cannula and Face Mask

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.
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Oxygen percentage setting:...

Oxygen Delivering System II: Venturi Mask and Transtracheal Oxygen

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 Requirements and Growth Patterns

Oxygen Requirements and Growth Patterns

Microorganisms exhibit diverse oxygen requirements and growth patterns driven by their metabolic strategies and environmental adaptations. Oxygen, while essential for many organisms, can also be toxic under certain conditions, shaping how microorganisms grow and survive.Oxygen Requirements of MicroorganismsMicroorganisms are classified based on their ability to use or tolerate oxygen:● Obligate aerobes like Mycobacterium tuberculosis need oxygen for energy production, as it serves as the...

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Related Experiment Video

Updated: Jul 27, 2026

Identifying Per- and Polyfluorinated Chemical Species with a Combined Targeted and Non-Targeted-Screening High-Resolution Mass Spectrometry Workflow

Identifying Per- and Polyfluorinated Chemical Species with a Combined Targeted and Non-Targeted-Screening High-Resolution Mass Spectrometry Workflow

Published on: April 18, 2019

Perfluorochemicals as oxygen transport vehicles.

¹Department of Nutrition, Harvard School of Public Health, Boston, Massachusetts 02115.

Biomaterials, Artificial Cells, and Artificial Organs

|January 1, 1988

Summary

Perfluorochemical liquids (PFCs) are effective gas carriers for biological applications. Phospholipid emulsions show promise over Pluronic F68 due to reduced complement activation, offering advantages in medical treatments.

Area of Science:

Biomedical Engineering
Biochemistry
Medical Science

Background:

Perfluorochemical liquids (PFCs) exhibit high gas solubility, making them valuable for biological applications.
PFCs require emulsification for intravenous use and organ perfusion, with particle size crucial for stability.

Purpose of the Study:

To evaluate the suitability of PFC emulsions as gas carriers in biological systems.
To compare the biocompatibility of different emulsifying agents for PFCs.

Main Methods:

Investigating the gas solubility properties of PFCs.
Assessing the stability and biocompatibility of PFC emulsions stabilized by Pluronic F68 and phospholipids.
Monitoring complement activation and its effects on leukocytes and oxygen tension.

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Synthesis, Hemoglobin Encapsulation and Biorthogonal PEGylation in Hierarchically Porous UiO-66 Nanoparticles for Oxygen Delivery Applications

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Identifying Per- and Polyfluorinated Chemical Species with a Combined Targeted and Non-Targeted-Screening High-Resolution Mass Spectrometry Workflow

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Main Results:

PFCs demonstrate significant oxygen and carbon dioxide solubility.
Phospholipid-stabilized PFC emulsions do not activate complement, unlike Pluronic F68 emulsions.
Pluronic F68 emulsions can cause reversible complement activation, transient leukopenia, and decreased oxygen tension.

Conclusions:

Phospholipid-stabilized PFC emulsions are advantageous due to their lack of complement activation.
PFC emulsions are being researched for tumor therapy, cardiac ischemia, and cerebral ischemia treatment.
Further research into PFC applications in medicine is anticipated.