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Related Concept Videos

Oxygen Delivering System II: Venturi Mask and Transtracheal Oxygen01:16

Oxygen Delivering System II: Venturi Mask and Transtracheal Oxygen

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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,...
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Carbon Dioxide Transport in the Blood01:19

Carbon Dioxide Transport in the Blood

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Carbon dioxide (CO2) transport in the blood is critical to human physiology. On average, our body cells produce around 200 mL of CO2 per minute, precisely the quantity expelled by the lungs. This process involves the transportation of CO2 from the tissue cells to the lungs in three primary forms.
Forms of CO2 Transport
1. Dissolved in plasma: A small percentage (7-10%) of CO2 is transported and dissolved directly in the plasma.
2. Carbaminohemoglobin: Just over 20% of CO2 is chemically bound to...
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Overview of Respiratory System01:23

Overview of Respiratory System

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The respiratory system is a complex biological apparatus that facilitates the exchange of gases, specifically oxygen and carbon dioxide, between our bodies and the environment. This system plays a vital role in the physiological process of respiration, an essential function for sustaining life.
What is the Respiratory System?
The respiratory system consists of a series of organs responsible for taking in oxygen and expelling carbon dioxide. The primary function of the respiratory system is to...
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Respiration and Gaseous Exchange01:20

Respiration and Gaseous Exchange

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The intricate interplay between the cardiovascular and respiratory systems is crucial for efficiently transporting respiratory gases throughout the body. Let us explore the cardiovascular system's multifaceted functions, emphasizing its pivotal role in gas exchange.
Respiration involves the exchange of gases, especially oxygen (O2) and carbon dioxide (CO2), between the alveoli and body cells, a process facilitated by blood circulation. As a result, the cardiovascular system, which involves...
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Assessment of Diffusion and Perfusion01:17

Assessment of Diffusion and Perfusion

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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...
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Oxygen Delivering System I: Nasal Cannula and Face Mask01:26

Oxygen Delivering System I: Nasal Cannula and Face Mask

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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:...
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Related Experiment Video

Updated: Feb 27, 2026

Retinal Vascular Reactivity as Assessed by Optical Coherence Tomography Angiography
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Circle (CO2 reabsorbing) breathing systems: Human applications.

Patrick Magee1

  • 1Self Employed, Bath, UK.

Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
|June 30, 2017
PubMed
Summary

Circle breathing systems recycle exhaled air for various extreme environments, from diving to space. These artificial breathing systems enhance safety and efficiency by conserving gas supply.

Keywords:
Anaesthetic circle systemscarbon dioxide absorptiondecompression sicknessdiving breathing systemslow fresh-gas flowspacesuit life support systems

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Area of Science:

  • Biomedical Engineering
  • Environmental Physiology
  • Aerospace Medicine

Background:

  • Artificial breathing systems are crucial for human survival in extreme environments, including anaesthesia, intensive care, mountaineering, firefighting, space exploration, and underwater diving.
  • Circle breathing systems, which absorb exhaled carbon dioxide and recirculate unused gases, offer economic and environmental benefits by significantly reducing fresh gas requirements.
  • These systems operate across a range of ambient pressures and gas concentrations, adapting to diverse environmental challenges.

Purpose of the Study:

  • To provide a comprehensive overview of artificial breathing systems, with a focus on the application and variations of circle breathing systems.
  • To highlight the engineering demands and operational contexts of circle breathing systems in different extreme environments.
  • To discuss the gas mixtures and pressure requirements tailored for specific applications like anaesthesia, mountaineering, firefighting, space activity, and diving.

Main Methods:

  • Review of existing literature and technical specifications of various artificial breathing systems.
  • Analysis of the operational principles of circle breathing systems, including carbon dioxide absorption and gas recirculation.
  • Comparative assessment of system requirements (pressure, gas composition, flow rates) across different extreme environments.

Main Results:

  • Circle breathing systems are versatile, finding application in diverse fields from medical settings to extreme exploration.
  • System demands vary significantly; anaesthesia systems are less demanding but serve vulnerable patients, while aerospace and diving systems require high-flow and specific gas mixtures under pressure.
  • The design and gas composition of circle systems are critically adapted to mitigate risks such as decompression sickness, nitrogen narcosis, and oxygen toxicity at varying depths and altitudes.

Conclusions:

  • Circle breathing systems represent a vital technology for enabling human activity in extreme environments.
  • Adaptability in gas composition, pressure, and flow rates is key to the successful and safe operation of these systems.
  • Further research and development in artificial breathing systems can enhance human endurance and safety in challenging conditions.